diff --git a/langgraph/checkpoint/sqlite.py b/langgraph/checkpoint/sqlite.py
index 94c64cf34..b4db7584f 100644
--- a/langgraph/checkpoint/sqlite.py
+++ b/langgraph/checkpoint/sqlite.py
@@ -445,6 +445,7 @@ def search_where(metadata_query: CheckpointMetadata, predicates: List[str] = [])
 
     This method returns the operator as well (=, IS).
     """
+
     def _where_value(query_value: Any) -> str:
         if query_value is None:
             return "IS NULL"