diff --git a/lightrag/operate.py b/lightrag/operate.py
index 30983145..cd517d69 100644
--- a/lightrag/operate.py
+++ b/lightrag/operate.py
@@ -1152,7 +1152,8 @@ async def _get_node_data(
             "entity",
             "type",
             "description",
-            "rank" "created_at",
+            "rank",
+            "created_at",
         ]
     ]
     for i, n in enumerate(node_datas):