[Bug]: Call to undefined function OCA\\DAV\\Avatars\\imagepng()

[cgzones]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Caused by Nextcloud desktop app the server logs the following error message regularly:

Dec 16 12:44:26 host Nextcloud[1096]: {"reqId":"aUFGGhkH6DWNuxPEU_B8TwAAAFY","level":3,"time":"2025-12-16T11:44:26+00:00","remoteAddr":"<<REMOTE_IP>>","user":"christian","app":"webdav","method":"GET","url":"/remote.php/dav/avatars/christian/128.png","message":"{\"Exception\":\"Error\",\"Message\":\"Call to undefined function OCA\\\\DAV\\\\Avatars\\\\imagepng()\",\"Code\":0,\"Trace\":[{\"file\":\"/var/www/sites/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php\",\"line\":85,\"function\":\"get\",\"class\":\"OCA\\\\DAV\\\\Avatars\\\\AvatarNode\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php\",\"line\":89,\"function\":\"httpGet\",\"class\":\"Sabre\\\\DAV\\\\CorePlugin\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php\",\"line\":472,\"function\":\"emit\",\"class\":\"Sabre\\\\DAV\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/apps/dav/lib/Connector/Sabre/Server.php\",\"line\":211,\"function\":\"invokeMethod\",\"class\":\"Sabre\\\\DAV\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/apps/dav/lib/Server.php\",\"line\":424,\"function\":\"start\",\"class\":\"OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/apps/dav/appinfo/v2/remote.php\",\"line\":22,\"function\":\"exec\",\"class\":\"OCA\\\\DAV\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/remote.php\",\"line\":151,\"args\":[\"/var/www/sites/nextcloud/apps/dav/appinfo/v2/remote.php\"],\"function\":\"require_once\"}],\"File\":\"/var/www/sites/nextcloud/apps/dav/lib/Avatars/AvatarNode.php\",\"Line\":45,\"message\":\"Call to undefined function OCA\\\\DAV\\\\Avatars\\\\imagepng()\",\"exception\":{},\"CustomMessage\":\"Call to undefined function OCA\\\\DAV\\\\Avatars\\\\imagepng()\"}","userAgent":"Mozilla/5.0 (Linux) mirall/4.0.4daily (Nextcloud, org.kde.Platform-6.17.11-300.fc43.x86_64 ClientArchitecture: x86_64 OsArchitecture: x86_64)","version":"32.0.3.2","clientReqId":"693042ee-0d4c-483c-9a90-ddfab71bceff"}

Dec 16 12:44:26 host Nextcloud[1096]: {"reqId":"aUFGGhkH6DWNuxPEU_B8TwAAAFY","level":3,"time":"2025-12-16T11:44:26+00:00","remoteAddr":"<<REMOTE_IP>>","user":"christian","app":"no app in context","method":"GET","url":"/remote.php/dav/avatars/christian/128.png","message":"{\"Exception\":\"Error\",\"Message\":\"Call to undefined function OCA\\\\DAV\\\\Avatars\\\\imagepng()\",\"Code\":0,\"Trace\":[{\"file\":\"/var/www/sites/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php\",\"line\":85,\"function\":\"get\",\"class\":\"OCA\\\\DAV\\\\Avatars\\\\AvatarNode\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php\",\"line\":89,\"function\":\"httpGet\",\"class\":\"Sabre\\\\DAV\\\\CorePlugin\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php\",\"line\":472,\"function\":\"emit\",\"class\":\"Sabre\\\\DAV\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/apps/dav/lib/Connector/Sabre/Server.php\",\"line\":211,\"function\":\"invokeMethod\",\"class\":\"Sabre\\\\DAV\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/apps/dav/lib/Server.php\",\"line\":424,\"function\":\"start\",\"class\":\"OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/apps/dav/appinfo/v2/remote.php\",\"line\":22,\"function\":\"exec\",\"class\":\"OCA\\\\DAV\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/sites/nextcloud/remote.php\",\"line\":151,\"args\":[\"/var/www/sites/nextcloud/apps/dav/appinfo/v2/remote.php\"],\"function\":\"require_once\"}],\"File\":\"/var/www/sites/nextcloud/apps/dav/lib/Avatars/AvatarNode.php\",\"Line\":45,\"message\":\"Uncaught exception\",\"exception\":{},\"CustomMessage\":\"Uncaught exception\"}","userAgent":"Mozilla/5.0 (Linux) mirall/4.0.4daily (Nextcloud, org.kde.Platform-6.17.11-300.fc43.x86_64 ClientArchitecture: x86_64 OsArchitecture: x86_64)","version":"32.0.3.2","clientReqId":"693042ee-0d4c-483c-9a90-ddfab71bceff"}

Steps to reproduce

1. just starting the Nexcloud Desktop app

Expected behavior

No error message.

Nextcloud Server version

32

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.4

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

[joshtrichards]

imagepng() is a core function of PHP's GD extension (which is required by Nextcloud). Are you sure you have GD installed and that it's been built with png support?

[susnux]

This happens if the gd extension of PHP is either not installed or not enabled for PHP.

php-gd is a required extension for Nextcloud, see also:
https://docs.nextcloud.com/server/latest/admin_manual/installation/php_configuration.html#required-php-modules