diff --git a/video-gen-api/app/services/generation_ai_service.py b/video-gen-api/app/services/generation_ai_service.py
index 0b4a25ab..2a67a06f 100644
--- a/video-gen-api/app/services/generation_ai_service.py
+++ b/video-gen-api/app/services/generation_ai_service.py
@@ -237,7 +237,7 @@ async def create_async_generation_task(db: AsyncSession, current_user: User, req
         if existing:
             return existing
 
-    refs = [r.model_dump() for r in (req.media_references or [])]
+    refs = [r.model_dump(exclude_none=True) for r in (req.media_references or [])]
     now = datetime.now(timezone.utc)
     task_id = generate_id()