fix: ensure static error page is loaded correctly for custom user errors (#13952)

rChaoz · Rich-Harris · web-flow · commit bfa3b9c6ba6d · 2025-08-20T12:30:39.000-04:00
* fix the bug

* changeset

* format

---------

Co-authored-by: Rich Harris &lt;rich.harris@vercel.com&gt;
diff --git a/.changeset/fine-pens-attend.md b/.changeset/fine-pens-attend.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: ensure static error page is loaded correctly for custom user errors
diff --git a/packages/kit/src/runtime/server/utils.js b/packages/kit/src/runtime/server/utils.js
@@ -100,7 +100,8 @@ export async function handle_fatal_error(event, state, options, error) {
  */
 export async function handle_error_and_jsonify(event, state, options, error) {
 	if (error instanceof HttpError) {
-		return error.body;
+		// @ts-expect-error custom user errors may not have a message field if App.Error is overwritten
+		return { message: 'Unknown Error', ...error.body };
 	}
 
 	if (__SVELTEKIT_DEV__ && typeof error == 'object') {

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +'@sveltejs/kit': patch
 +---
++
 +fix: ensure static error page is loaded correctly for custom user errors
Original file line number	Diff line number	Diff line change
`@@ -100,7 +100,8 @@ export async function handle_fatal_error(event, state, options, error) {`
`100`	`100`	`*/`
`101`	`101`	`export async function handle_error_and_jsonify(event, state, options, error) {`
`102`	`102`	`if (error instanceof HttpError) {`
`103`		`- return error.body;`
	`103`	`+ // @ts-expect-error custom user errors may not have a message field if App.Error is overwritten`
	`104`	`+ return { message: 'Unknown Error', ...error.body };`
`104`	`105`	`}`
`105`	`106`
`106`	`107`	`if (__SVELTEKIT_DEV__ && typeof error == 'object') {`