diff --git a/src/memos/graph_dbs/polardb.py b/src/memos/graph_dbs/polardb.py
index bbf62cc34..551c6d82e 100644
--- a/src/memos/graph_dbs/polardb.py
+++ b/src/memos/graph_dbs/polardb.py
@@ -4744,7 +4744,7 @@ def delete_node_by_prams(
 
         # Then, combine with user_name condition using AND (must match user_name AND one of the data conditions)
         user_name_where = " OR ".join(user_name_conditions)
-        ids_where = f"({user_name_where}) AND ({data_conditions})"
+        ids_where = f"{user_name_where} AND ({data_conditions})"
 
         # Use Cypher DELETE query
         # First count matching nodes to get accurate count