diff --git a/rq_dashboard/web.py b/rq_dashboard/web.py
index 370abf71..14512fff 100644
--- a/rq_dashboard/web.py
+++ b/rq_dashboard/web.py
@@ -97,7 +97,7 @@ def serialize_job(job):
         ended_at=serialize_date(job.ended_at),
         origin=job.origin,
         result=job._result,
-        exc_info=str(job.exc_info),
+        exc_info=str(job.exc_info) if job.exc_info else None,
         description=job.description)