diff --git a/backend/open_webui/retrieval/utils.py b/backend/open_webui/retrieval/utils.py
index 055f750122..b1597aa2db 100644
--- a/backend/open_webui/retrieval/utils.py
+++ b/backend/open_webui/retrieval/utils.py
@@ -838,6 +838,7 @@ async def query_collection_with_hybrid_search(
             return name, await ASYNC_VECTOR_DB_CLIENT.get(collection_name=name)
         except Exception as e:
             log.exception(f'Failed to fetch collection {name}: {e}')
+            failed_collection_names.add(name)
             return name, None
 
     collection_results = dict(await asyncio.gather(*(_fetch_collection(name) for name in collection_names)))