diff --git a/web/components/details/sourcePlaybackPresentation.ts b/web/components/details/sourcePlaybackPresentation.ts
index e71b1da88..381f83df1 100644
--- a/web/components/details/sourcePlaybackPresentation.ts
+++ b/web/components/details/sourcePlaybackPresentation.ts
@@ -135,15 +135,21 @@ export function sourceBadges(stream: StreamSource, info: { debrid: boolean; unca
  * what tells two "Torrentio 1080p" rows apart), else the addon's own label.
  */
 export function sourceTitle(stream: Pick<StreamSource, "source" | "addonName" | "description" | "behaviorHints">) {
-  const file = stream.behaviorHints?.filename?.trim();
+  const rawFilename = stream.behaviorHints?.filename;
+  const file = typeof rawFilename === "string" ? rawFilename.trim() : "";
   if (file) return file;
-  const firstLine = stream.description?.split("\n").map((line) => line.trim()).find(Boolean);
+
+  const description = typeof stream.description === "string" ? stream.description : "";
+  const firstLine = description.split("\n").map((line) => line.trim()).find(Boolean);
   // Stremio addons put the release name on the first description line and
   // decorations (👤 seeders, 💾 size, ⚙️ provider) on the following ones.
   if (firstLine && /[._ -]/.test(firstLine) && firstLine.length > 8 && !/^[👤💾⚙️🔗📦]/u.test(firstLine)) {
     return firstLine.replace(/\s*💾.*$/u, "").trim() || firstLine;
   }
-  return stream.source || stream.addonName;
+
+  if (typeof stream.source === "string" && stream.source) return stream.source;
+  if (typeof stream.addonName === "string" && stream.addonName) return stream.addonName;
+  return "Source";
 }
 
 export type SourceFilter = "all" | "here" | "4k" | "1080p" | "cached";
diff --git a/web/tests/source-title-runtime-types.test.cjs b/web/tests/source-title-runtime-types.test.cjs
new file mode 100644
index 000000000..387812c9e
--- /dev/null
+++ b/web/tests/source-title-runtime-types.test.cjs
@@ -0,0 +1,29 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const { load } = require('./load.cjs');
+
+const { sourceTitle } = load('components/details/sourcePlaybackPresentation.ts');
+const stream = (overrides = {}) => ({
+  source: 'Fixture',
+  addonName: 'Library',
+  ...overrides
+});
+
+test('sourceTitle tolerates malformed runtime filename values', () => {
+  for (const filename of [123, { name: 'movie.mkv' }, ['movie.mkv']]) {
+    assert.equal(sourceTitle(stream({ behaviorHints: { filename } })), 'Fixture');
+  }
+});
+
+test('sourceTitle tolerates malformed runtime description values', () => {
+  for (const description of [123, { text: 'movie' }, ['movie']]) {
+    assert.equal(sourceTitle(stream({ description })), 'Fixture');
+  }
+});
+
+test('sourceTitle keeps valid provider labels and safe fallbacks', () => {
+  assert.equal(sourceTitle(stream({ behaviorHints: { filename: '  Movie.2026.1080p.mkv  ' } })), 'Movie.2026.1080p.mkv');
+  assert.equal(sourceTitle(stream({ description: 'Movie.2026.1080p.WEB-DL.mkv\n💾 3.2 GB' })), 'Movie.2026.1080p.WEB-DL.mkv');
+  assert.equal(sourceTitle({ source: 42, addonName: 'Fallback addon', behaviorHints: { filename: null }, description: null }), 'Fallback addon');
+  assert.equal(sourceTitle({ source: null, addonName: null, behaviorHints: { filename: {} }, description: {} }), 'Source');
+});