When creating Model getting Uninitialized string offset 0

[jboomer007]

Bug report

What I did

Tried to create a model from Our postgresql Database in dev tools
??

What I expected to happen

It to create the model
??

What happened

Got an Error
vendor/composer/ClassLoader.php#497
ErrorException
494
495
496
497
498
499
500
501
// PSR-4 lookup
$logicalPathPsr4 = strtr($class, '\', DIRECTORY_SEPARATOR) . $ext;

    $first = $class[0];
    if (isset($this->prefixLengthsPsr4[$first])) {
        $subPath = $class;
        while (false !== $lastPos = strrpos($subPath, '\\')) {

??

What I've already tried to fix it

looked at logs and everything.
??

Backpack, Laravel, PHP, DB version

When I run php artisan backpack:version the output is:
8.4.15

PHP EXTENSIONS:

Core, date, libxml, openssl, pcre, zlib, filter, hash, json, pcntl, random, Reflection, SPL, session, standard, sodium, mysqlnd, PDO, xml, bcmath, calendar, ctype, curl, dom, mbstring, FFI, fileinfo, ftp, gettext, iconv, igbinary, intl, exif, mysqli, pdo_mysql, pdo_pgsql, pdo_sqlite, pgsql, Phar, posix, readline, shmop, SimpleXML, soap, sockets, sqlite3, sysvmsg, sysvsem, sysvshm, tokenizer, xmlreader, xmlwriter, xsl, zip, redis, Zend OPcache

LARAVEL VERSION:

12.42.0.0

BACKPACK PACKAGE VERSIONS:

backpack/basset: 2.0.0
backpack/crud: 7.0.12
backpack/devtools: 4.0.1
backpack/generators: v4.1.0
backpack/pro: 3.0.2
backpack/theme-tabler: 2.0.0

Operating System and Server Setup

Ubuntu server with nginx and PHP 8.4 fpm

[backpack-ai-bot]

🚨 Bot is not sure about this answer. Please verify. 🚨

I’m sorry, but the knowledge sources don’t mention this specific “Uninitialized string offset 0” error in vendor/composer/ClassLoader.php when using DevTools with PostgreSQL, so I can’t give a confirmed root cause or fix.

From the available docs and issues:

• There are several DevTools model‑generation crashes reported (often 500 errors, trace errors, or crashes when creating models/relations), and in most of them maintainers first ask to run composer update so all Backpack and DevTools dependencies are on the latest compatible versions. Updating dependencies has fixed some DevTools tracing/generation errors in the past.[DevTools error; Devtools crash]
• There are also reports of DevTools breaking when multiple connections or non‑MySQL databases are involved (e.g. MongoDB), where the schema/introspection logic fails.[Mongo bug] None of them, however, show the same Composer ClassLoader “Uninitialized string offset 0” error you’re seeing.

Because of that, I can’t reliably say whether this is:

• a DevTools bug specific to PostgreSQL on Backpack 7 / DevTools 4, or
• a Composer autoloading issue triggered by some malformed class name or configuration.

Given the lack of an exact match in the sources, the best I can suggest, based only on what’s documented, is:

1. Ensure all Backpack packages (including DevTools) and their dependencies are fully updated via Composer, then try again.[DevTools error; Devtools crash]
2. If the error persists, open an issue in the Backpack community forum or CRUD repo with:
   • the full stack trace (not just the ClassLoader.php snippet),
   • the exact DevTools action (e.g. “Create Model from DB table X on connection Y”),
   • confirmation that you’re using PostgreSQL as the connection DevTools is targeting.

The existing issues don’t provide enough information to map your error to a known fix, so maintainers would likely need that extra detail to reproduce and patch it.

ℹ️ Please note our AI Bot does not reply to follow-ups, this will be the only AI answer in this thread. If the AI helped you find the answer, please mark it as answered or write details below so it can learn. Then close the conversation. If not, please give more information for when a human reads this. ℹ️

Relevant sources:

Github Issue (closed): [Bug] InlineCreate encountered an error with the Phone field
Github Issue (closed): Page Expired
Github Issue (closed): 4.1.* install on Laravel 8 [Bug]
After installing I get ERROR 500. Can´t find the issue
Github Issue (closed): [Bug] Mongo Db Connection
Github Issue (open): [Bug] [v7]
Github Issue (closed): Error Undefined array key 1 with model created by devtools
Github Issue (closed): [Bug] Backpack doesn't work with nginx in docker
Github Issue (closed): Couldn’t work out with the DevTool
Github Issue (closed): [Bug]
Github Issue (closed): [Bug]
Github Issue (closed): [Bug] URGENT -- All Backends Down Across Servers
Github Issue (closed): Devtools Crash
DevTools: Trying to access array offset on value of type null

[jboomer007]

here is the full stack trace:
[2025-12-12 17:59:39] local.ERROR: Uninitialized string offset 0 {"exception":"[object] (ErrorException(code: 0): Uninitialized string offset 0 at /srv/MyMeterReadsV3/vendor/composer/ClassLoader.php:497)
[stacktrace]
#0 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(258): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError()
Laravel-Backpack/devtools-issues#1 /srv/MyMeterReadsV3/vendor/composer/ClassLoader.php(497): Illuminate\Foundation\Bootstrap\HandleExceptions->{closure:Illuminate\Foundation\Bootstrap\HandleExceptions::forwardsTo():257}()
Laravel-Backpack/devtools-issues#2 /srv/MyMeterReadsV3/vendor/composer/ClassLoader.php(458): Composer\Autoload\ClassLoader->findFileWithExtension()
Laravel-Backpack/devtools-issues#3 /srv/MyMeterReadsV3/vendor/composer/ClassLoader.php(425): Composer\Autoload\ClassLoader->findFile()
Laravel-Backpack/devtools-issues#4 [internal function]: Composer\Autoload\ClassLoader->loadClass()
#219 /srv/MyMeterReadsV3/vendor/laravel-shift/blueprint/src/Tracer.php(77): class_exists()
#220 /srv/MyMeterReadsV3/vendor/laravel-shift/blueprint/src/Tracer.php(27): Blueprint\Tracer->loadModel()
Laravel-Backpack/devtools-issues#7 /srv/MyMeterReadsV3/vendor/laravel-shift/blueprint/src/Commands/TraceCommand.php(45): Blueprint\Tracer->execute()
#221 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(36): Blueprint\Commands\TraceCommand->handle()
Laravel-Backpack/devtools-issues#9 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Container/Util.php(43): Illuminate\Container\BoundMethod::{closure:Illuminate\Container\BoundMethod::call():35}()
#222 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(96): Illuminate\Container\Util::unwrapIfClosure()
Laravel-Backpack/devtools-issues#11 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(35): Illuminate\Container\BoundMethod::callBoundMethod()
Laravel-Backpack/devtools-issues#12 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Container/Container.php(799): Illuminate\Container\BoundMethod::call()
Laravel-Backpack/devtools-issues#13 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Console/Command.php(211): Illuminate\Container\Container->call()
Laravel-Backpack/devtools-issues#14 /srv/MyMeterReadsV3/vendor/symfony/console/Command/Command.php(341): Illuminate\Console\Command->execute()
Laravel-Backpack/devtools-issues#15 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Console/Command.php(180): Symfony\Component\Console\Command\Command->run()
Laravel-Backpack/CRUD#3925 /srv/MyMeterReadsV3/vendor/symfony/console/Application.php(1102): Illuminate\Console\Command->run()
Laravel-Backpack/devtools-issues#17 /srv/MyMeterReadsV3/vendor/symfony/console/Application.php(356): Symfony\Component\Console\Application->doRunCommand()
Laravel-Backpack/devtools-issues#18 /srv/MyMeterReadsV3/vendor/symfony/console/Application.php(195): Symfony\Component\Console\Application->doRun()
Laravel-Backpack/devtools-issues#19 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Console/Application.php(165): Symfony\Component\Console\Application->run()
#230 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(437): Illuminate\Console\Application->call()
#224 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php(363): Illuminate\Foundation\Console\Kernel->call()
Laravel-Backpack/devtools-issues#22 /srv/MyMeterReadsV3/vendor/backpack/devtools/src/Generators/BlueprintGenerator.php(127): Illuminate\Support\Facades\Facade::__callStatic()
#223 /srv/MyMeterReadsV3/vendor/backpack/devtools/src/Generators/BlueprintGenerator.php(83): Backpack\DevTools\Generators\BlueprintGenerator->createAndRunYamlFile()
#229 /srv/MyMeterReadsV3/vendor/backpack/devtools/src/Generators/BlueprintGenerator.php(48): Backpack\DevTools\Generators\BlueprintGenerator->generateModel()
#225 /srv/MyMeterReadsV3/vendor/backpack/devtools/src/Http/Controllers/ModelCrudController.php(279): Backpack\DevTools\Generators\BlueprintGenerator->generate()
Laravel-Backpack/devtools-issues#26 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(54): Backpack\DevTools\Http\Controllers\ModelCrudController->store()
Laravel-Backpack/devtools-issues#27 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(43): Illuminate\Routing\Controller->callAction()
Laravel-Backpack/devtools-issues#28 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Routing/Route.php(265): Illuminate\Routing\ControllerDispatcher->dispatch()
Laravel-Backpack/devtools-issues#29 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Routing/Route.php(211): Illuminate\Routing\Route->runController()
#30 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Routing/Router.php(822): Illuminate\Routing\Route->run()
Laravel-Backpack/devtools-issues#31 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Routing\Router->{closure:Illuminate\Routing\Router::runRouteWithinStack():821}()
Laravel-Backpack/devtools-issues#32 /srv/MyMeterReadsV3/vendor/backpack/crud/src/app/Http/Controllers/CrudController.php(41): Illuminate\Pipeline\Pipeline->{closure:Illuminate\Pipeline\Pipeline::prepareDestination():178}()
Laravel-Backpack/devtools-issues#33 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(201): Backpack\CRUD\app\Http\Controllers\CrudController->{closure:Backpack\CRUD\app\Http\Controllers\CrudController::__construct():37}()
Laravel-Backpack/devtools-issues#34 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#35 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ConvertEmptyStringsToNull.php(31): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle()
Laravel-Backpack/devtools-issues#36 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull->handle()
Laravel-Backpack/devtools-issues#37 /srv/MyMeterReadsV3/app/Http/Middleware/CheckIfAdmin.php(67): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#38 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): App\Http\Middleware\CheckIfAdmin->handle()
Laravel-Backpack/devtools-issues#39 /srv/MyMeterReadsV3/vendor/barryvdh/laravel-debugbar/src/Middleware/InjectDebugbar.php(66): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#40 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Barryvdh\Debugbar\Middleware\InjectDebugbar->handle()
Laravel-Backpack/devtools-issues#41 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Http/Middleware/AddLinkHeadersForPreloadedAssets.php(32): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
#228 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Http\Middleware\AddLinkHeadersForPreloadedAssets->handle()
#226 /srv/MyMeterReadsV3/vendor/inertiajs/inertia-laravel/src/Middleware.php(122): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#44 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Inertia\Middleware->handle()
Laravel-Backpack/devtools-issues#45 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php(50): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#46 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Routing\Middleware\SubstituteBindings->handle()
Laravel-Backpack/devtools-issues#47 /srv/MyMeterReadsV3/vendor/backpack/crud/src/app/Http/Middleware/AuthenticateSession.php(62): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#48 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Backpack\CRUD\app\Http\Middleware\AuthenticateSession->handle()
Laravel-Backpack/devtools-issues#49 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php(87): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#50 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Foundation\Http\Middleware\VerifyCsrfToken->handle()
Laravel-Backpack/devtools-issues#51 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(48): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
#227 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\View\Middleware\ShareErrorsFromSession->handle()
#53 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(120): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#54 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(63): Illuminate\Session\Middleware\StartSession->handleStatefulRequest()
Laravel-Backpack/devtools-issues#55 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Session\Middleware\StartSession->handle()
Laravel-Backpack/devtools-issues#56 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(36): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#57 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse->handle()
Laravel-Backpack/devtools-issues#58 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(74): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#59 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Cookie\Middleware\EncryptCookies->handle()
#1439 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(137): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
#1437 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Routing/Router.php(821): Illuminate\Pipeline\Pipeline->then()
Laravel-Backpack/devtools-issues#62 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Routing/Router.php(800): Illuminate\Routing\Router->runRouteWithinStack()
Laravel-Backpack/devtools-issues#63 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Routing/Router.php(764): Illuminate\Routing\Router->runRoute()
Laravel-Backpack/devtools-issues#64 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Routing/Router.php(753): Illuminate\Routing\Router->dispatchToRoute()
#1438 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(200): Illuminate\Routing\Router->dispatch()
#1436 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Kernel->{closure:Illuminate\Foundation\Http\Kernel::dispatchToRouter():197}()
Laravel-Backpack/devtools-issues#67 /srv/MyMeterReadsV3/vendor/livewire/livewire/src/Features/SupportDisablingBackButtonCache/DisableBackButtonCacheMiddleware.php(19): Illuminate\Pipeline\Pipeline->{closure:Illuminate\Pipeline\Pipeline::prepareDestination():178}()
Laravel-Backpack/devtools-issues#68 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Livewire\Features\SupportDisablingBackButtonCache\DisableBackButtonCacheMiddleware->handle()
Laravel-Backpack/devtools-issues#69 /srv/MyMeterReadsV3/vendor/barryvdh/laravel-debugbar/src/Middleware/InjectDebugbar.php(66): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#70 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Barryvdh\Debugbar\Middleware\InjectDebugbar->handle()
Laravel-Backpack/devtools-issues#71 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#72 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ConvertEmptyStringsToNull.php(31): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle()
Laravel-Backpack/devtools-issues#73 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull->handle()
Laravel-Backpack/devtools-issues#74 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
Laravel-Backpack/devtools-issues#75 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TrimStrings.php(51): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle()
Laravel-Backpack/devtools-issues#76 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Foundation\Http\Middleware\TrimStrings->handle()
#1440 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Http/Middleware/ValidatePostSize.php(27): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
#78 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Http\Middleware\ValidatePostSize->handle()
#79 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/PreventRequestsDuringMaintenance.php(109): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
#80 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Foundation\Http\Middleware\PreventRequestsDuringMaintenance->handle()
#81 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Http/Middleware/HandleCors.php(48): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
#82 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Http\Middleware\HandleCors->handle()
#83 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Http/Middleware/TrustProxies.php(58): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
#84 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Http\Middleware\TrustProxies->handle()
#85 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/InvokeDeferredCallbacks.php(22): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
#86 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Foundation\Http\Middleware\InvokeDeferredCallbacks->handle()
#87 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Http/Middleware/ValidatePathEncoding.php(26): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
#88 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(219): Illuminate\Http\Middleware\ValidatePathEncoding->handle()
#89 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(137): Illuminate\Pipeline\Pipeline->{closure:{closure:Illuminate\Pipeline\Pipeline::carry():194}:195}()
#90 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(175): Illuminate\Pipeline\Pipeline->then()
#91 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(144): Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter()
#92 /srv/MyMeterReadsV3/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(1220): Illuminate\Foundation\Http\Kernel->handle()
#93 /srv/MyMeterReadsV3/public/index.php(17): Illuminate\Foundation\Application->handleRequest()
#94 {main}
"}

Here is request body when creating the model:
{
"_token": "h9tTZDY4c3mN2e4Apy2NiSpFneX8LhZXL4N4HbDP",
"_http_referrer": "https://dev.mymeterreads.com/admin/devtools/model",
"_form_id": "crudForm",
"name": "note_category",
"columns": [
{
"show_modifiers": "0",
"column_name": "id",
"column_type": "id",
"modifiers": {
"unique": null,
"index": null,
"comment": null,
"charset": null,
"collation": null
}
}
],
"generate_migration": "0",
"generate_factory": "0",
"generate_seeder": "0",
"build_crud": "1",
"_save_action": "save_and_preview"
}

And here are the execute queries:

pgsql_2025
select * from "sessions" where "id" = 'oFHnP8ICbGZbZ42AJ2AbbutBKkitL6C2lEm4vQaJ' limit 1
156.67ms
pgsql_2025
select * from "users" where "id" = 2 limit 1
28.89ms
Backpack\DevTools\Models\Model
select name, type, not "notnull" as "nullable", dflt_value as "default", pk as "primary", hidden as "extra" from pragma_table_xinfo('models', 'main') order by cid asc
0.18ms
Backpack\DevTools\Models\Model
select "sql" from "main".sqlite_master where type = 'table' and name = 'models'
0.05ms

[backpack-ai-bot]

Kappa Answer:

The knowledge sources don’t mention this specific “Uninitialized string offset 0” error in vendor/composer/ClassLoader.php when using DevTools with PostgreSQL, so I can’t give a confirmed root cause or fix from the docs/issues I have.

However, there are a few closely related DevTools model‑generation problems that might help guide debugging:

• DevTools can crash when generating models/CRUDs if it can’t correctly infer table/connection metadata (for example, wrong or unexpected table names, or missing connection info). In one case, the problem was simply that the table name was in Italian and pluralization failed; using a standard plural English table name fixed DevTools. [Devtools error]
• Another DevTools crash was caused by Blueprint/DevTools not handling some project state correctly; running composer update to bring all dependencies in sync fixed it. [DevTools array offset]
• There’s also a report where DevTools failed when dealing with belongsTo / foreign keys and connection detection, throwing a type error in DatabaseSchema::getForTable() because the connection was null. [DevTools couldn’t work]

Given that, here are concrete things you can try, all grounded in those reports:

1. Check the table name & connection DevTools is using

   • Make sure the table name you select in DevTools:
     • Exists on the PostgreSQL connection you expect.
     • Uses a “normal” plural name (no special characters / unusual pluralization), at least for testing. [Devtools error]
   • If you have multiple DB connections, confirm that:
     • The model’s $connection (if set) matches a configured connection.
     • DevTools is pointing at the correct connection for that table (try with a simple table on the default connection to see if the error persists). [DevTools couldn’t work]

2. Update dependencies

   In a similar DevTools crash, updating all dependencies (including Blueprint and Backpack packages) resolved the issue. [DevTools array offset]

   You already seem to be on recent Backpack 7 packages, but you can still try:

   composer update
   php artisan optimize:clear

3. Try generating the same model via artisan

   As in another DevTools issue, generating the CRUD via artisan can help confirm if the problem is DevTools‑specific: [Devtools error]

   php artisan backpack:crud YourModelName

   • If this works but DevTools still crashes, it’s almost certainly a DevTools bug around how it reads your schema/connection.

4. Collect more precise error context

   Since the exception is thrown inside Composer’s ClassLoader, the real error is likely earlier in the stack trace (a class name being empty or malformed). To help the Backpack team reproduce:

   • Grab the full stack trace from storage/logs/laravel.log around that error.
   • Note exactly:
     • Which table you selected.
     • Which connection it’s on.
     • Whether the model already exists or DevTools is creating it from scratch.

Because I don’t have a report of this exact Composer ClassLoader “Uninitialized string offset 0” with DevTools and PostgreSQL in the knowledge sources, I can’t point to a confirmed bugfix or patch. The next best step is to open an issue (or comment on an existing DevTools issue) with:

• Your php artisan backpack:version output (which you already have),
• The full stack trace from laravel.log,
• The table name and connection details.

That will let the maintainers confirm whether this is a new DevTools bug in 4.0.1 with PostgreSQL and address it.

ℹ️ Please note our AI Bot does not reply to follow-ups, this will be the only AI answer in this thread. If the AI helped you find the answer, please mark it as answered or write details below so it can learn. Then close the conversation. If not, please give more information for when a human reads this. ℹ️

Relevant sources:

Github Issue (closed): Syntax error at vendor/backpack/generators/src/Services/BackpackCommand.php:30
Github Issue (open): [Bug] Column visibility not preserved in persistent table
Github Issue (closed): [Bug] Mongo Db Connection
Github Issue (open): [Bug] [v7]
Github Issue (closed): Error Undefined array key 1 with model created by devtools
Github Issue (closed): [Bug]
Github Issue (closed): [Bug] Backpack doesn't work with nginx in docker
Devtools error creating CRUD
Github Issue (closed): Couldn’t work out with the DevTool
Github Issue (closed): [Bug]
Github Issue (closed): [Bug] URGENT -- All Backends Down Across Servers
Github Issue (closed): Devtools Crash
Github Issue (closed): 4.1.* install on Laravel 8 [Bug]
DevTools: Trying to access array offset on value of type null

[backpack-ai-bot]

CrawlChat Answer:

I apologize, but I don't have specific documentation available to troubleshoot this "Uninitialized string offset 0" error when creating a model from PostgreSQL in DevTools.

This appears to be a rare edge case that likely relates to how DevTools 4.0.1 is parsing table schema information from your PostgreSQL database. The error trace points to PHP's autoloader, suggesting a class name or namespace issue during model generation.

What you could try:

1. Verify your PostgreSQL table structure has valid names (no special characters or reserved words at the start)
2. Check if the issue occurs with a simpler table first
3. Review your database connection configuration in .env
4. Clear any cached schemas (DevTools caches schema information)

Since this is a specific bug not covered in the available documentation, I'd recommend reaching out to Backpack support at [email protected] with your exact steps to reproduce and the full error trace. Your detailed version info and PHP extensions list will be helpful for them to diagnose this.

ℹ️ Please note our AI Bot does not reply to follow-ups, this will be the only AI answer in this thread. If the AI helped you find the answer, please mark it as answered or write details below so it can learn. Then close the conversation. If not, please give more information for when a human reads this. ℹ️

Relevant sources:

New file management · Laravel-Backpack/community-forum · Discussion #1095 · GitHub
Columns :: 7.x Docs :: Backpack for Laravel
[Bug] Not auto appended attributes not working with fetch
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DevTools :: Backpack for Laravel
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