diff --git a/backend/open_webui/apps/retrieval/utils.py b/backend/open_webui/apps/retrieval/utils.py
index 174e37495..992d46788 100644
--- a/backend/open_webui/apps/retrieval/utils.py
+++ b/backend/open_webui/apps/retrieval/utils.py
@@ -71,7 +71,7 @@ def query_doc(
     try:
         result = VECTOR_DB_CLIENT.search(
             collection_name=collection_name,
-            vectors=query_embedding,
+            vectors=[query_embedding],
             limit=k,
         )