diff --git a/backend/open_webui/tasks.py b/backend/open_webui/tasks.py
index 1fe268296e..6a1d6df84f 100644
--- a/backend/open_webui/tasks.py
+++ b/backend/open_webui/tasks.py
@@ -166,7 +166,7 @@ async def list_task_ids_by_item_id(redis, id):
     """
     if redis:
         return await redis_list_item_tasks(redis, id)
-    return item_tasks.get(id, [])
+    return list(item_tasks.get(id, []))
 
 
 async def save_response_stream(