diff --git a/frontend/src/routes/jobs/JobDetail.tsx b/frontend/src/routes/jobs/JobDetail.tsx
index 1470215..32a6488 100644
--- a/frontend/src/routes/jobs/JobDetail.tsx
+++ b/frontend/src/routes/jobs/JobDetail.tsx
@@ -749,7 +749,7 @@ export function JobDetail() {
                     ? 'TTS generation failed. Fix audio description text before retrying.'
                     : job.status === 'render_failed'
                     ? 'Video rendering failed.'
-                    : job.error
+                    : typeof job.error === 'string' && job.error
                     ? job.error
                     : 'Processing failed. Retry or escalate to support.'}
                 </p>