diff --git a/packages/domain/entities.py b/packages/domain/entities.py
index 027e4a854..ce6ed56c3 100755
--- a/packages/domain/entities.py
+++ b/packages/domain/entities.py
@@ -249,7 +249,7 @@ class Asset:
             storage_key=storage_key.strip(),
             mime_type=mime_type.strip(),
             file_size=file_size,
-            thumbnail_url=thumbnail_url,
+            thumbnail_url=str(thumbnail_url) if thumbnail_url else None,
             duration=duration,
             width=width,
             height=height,
diff --git a/tests/unit/test_ingest_validation.py b/tests/unit/test_ingest_validation.py
index c16780248..62aa7c1c4 100755
--- a/tests/unit/test_ingest_validation.py
+++ b/tests/unit/test_ingest_validation.py
@@ -339,9 +339,10 @@ class TestIngestAssetValidation:
                     True,
                 )
                 with patch("worker_app.tasks.ingest.SessionLocal", return_value=db):
-                    from worker_app.tasks.ingest import ingest_asset
+                    with patch("video_processing.thumbnail_generator.generate_and_upload_thumbnail", return_value=None):
+                        from worker_app.tasks.ingest import ingest_asset
 
-                    result = ingest_asset("job-valid-001")
+                        result = ingest_asset("job-valid-001")
 
         assert result["status"] == "completed"
         assert "asset_id" in result