diff --git a/tests/e2e/file-view-render.test.ts b/tests/e2e/file-view-render.test.ts
index 89cca628010..70838a9d9fa 100644
--- a/tests/e2e/file-view-render.test.ts
+++ b/tests/e2e/file-view-render.test.ts
@@ -39,6 +39,18 @@ test('pdf file', async ({page, request}) => {
   await assertFlushWithParent(container, page.locator('.file-view'));
 });
 
+test('code line anchors', async ({page, request}) => {
+  const repoName = `e2e-line-anchor-${randomString(8)}`;
+  const owner = env.GITEA_TEST_E2E_USER;
+  await apiCreateRepo(request, {name: repoName});
+  await apiCreateFiles(request, owner, repoName, [{path: 'test.txt', content: 'a\n'}]);
+  const url = `/${owner}/${repoName}/src/branch/main/test.txt`;
+  await page.goto(`${url}#L0`);
+  await page.goto(`${url}#L1`);
+  await expect(page.locator('.code-view tr.active')).toHaveCount(1);
+  await assertNoJsError(page);
+});
+
 test('asciicast file', async ({page, request}) => {
   const repoName = `e2e-asciicast-render-${randomString(8)}`;
   const owner = env.GITEA_TEST_E2E_USER;
diff --git a/web_src/js/features/repo-code.ts b/web_src/js/features/repo-code.ts
index 679577da325..54a63caa511 100644
--- a/web_src/js/features/repo-code.ts
+++ b/web_src/js/features/repo-code.ts
@@ -58,6 +58,7 @@ function selectRange(range: string): Element | null {
     stopLineNum = tmp;
     range = `${stop}-${start}`;
   }
+  if (startLineNum < 1) return null;
 
   const first = elLineNums[startLineNum - 1] ?? null;
   for (let i = startLineNum - 1; i <= stopLineNum - 1 && i < elLineNums.length; i++) {
diff --git a/web_src/js/modules/errors.test.ts b/web_src/js/modules/errors.test.ts
index 53618b45695..a8db4680b2e 100644
--- a/web_src/js/modules/errors.test.ts
+++ b/web_src/js/modules/errors.test.ts
@@ -17,7 +17,11 @@ test('isGiteaError', () => {
   expect(isGiteaError('', `Error\n    at chrome-extension://abc/content.js:1:1`)).toBe(false);
   expect(isGiteaError('', `Error\n    at https://other-site.com/script.js:1:1`)).toBe(false);
   expect(isGiteaError('', `Error\n    at ${origin}/assets/js/index.abc123.js:1:1`)).toBe(true);
+  expect(isGiteaError('', `Error\n    at ${origin}/web_src/js/index.ts:1:1`)).toBe(false);
   expect(isGiteaError(`${origin}/assets/js/index.js`, `Error\n    at chrome-extension://abc/content.js:1:1`)).toBe(false);
+  vi.spyOn(window.config, 'runModeIsProd', 'get').mockReturnValue(false);
+  expect(isGiteaError('', `Error\n    at ${origin}/web_src/js/index.ts:1:1`)).toBe(true);
+  vi.restoreAllMocks();
 });
 
 test('showGlobalErrorMessage', () => {
diff --git a/web_src/js/modules/errors.ts b/web_src/js/modules/errors.ts
index 5c62b4c5d9a..22c0e693ff3 100644
--- a/web_src/js/modules/errors.ts
+++ b/web_src/js/modules/errors.ts
@@ -58,6 +58,7 @@ export function isGiteaError(filename: string, stack: string): boolean {
   if (extensionRe.test(filename) || extensionRe.test(stack)) return false;
   const assetBaseUrl = new URL(`${windowConfig()?.assetUrlPrefix}/`, window.location.origin).href;
   if (filename && !filename.startsWith(assetBaseUrl) && !filename.startsWith(window.location.origin)) return false;
+  if (!windowConfig()?.runModeIsProd && stack.includes(`${window.location.origin}/web_src/`)) return true;
   return !stack || stack.includes(assetBaseUrl);
 }