diff --git a/lightrag/kg/neo4j_impl.py b/lightrag/kg/neo4j_impl.py
index e7a59b0c..b7b63580 100644
--- a/lightrag/kg/neo4j_impl.py
+++ b/lightrag/kg/neo4j_impl.py
@@ -307,20 +307,35 @@ class Neo4JStorage(BaseGraphStorage):
                             f"and {entity_name_label_target}: {str(e)}"
                         )
                         # Return default edge properties on error
-                        return {"weight": 0.0, "description": None, "keywords": None, "source_id": None}
+                        return {
+                            "weight": 0.0,
+                            "description": None,
+                            "keywords": None,
+                            "source_id": None,
+                        }
 
                 logger.debug(
                     f"{inspect.currentframe().f_code.co_name}: No edge found between {entity_name_label_source} and {entity_name_label_target}"
                 )
                 # Return default edge properties when no edge found
-                return {"weight": 0.0, "description": None, "keywords": None, "source_id": None}
+                return {
+                    "weight": 0.0,
+                    "description": None,
+                    "keywords": None,
+                    "source_id": None,
+                }
 
         except Exception as e:
             logger.error(
                 f"Error in get_edge between {source_node_id} and {target_node_id}: {str(e)}"
             )
             # Return default edge properties on error
-            return {"weight": 0.0, "description": None, "keywords": None, "source_id": None}
+            return {
+                "weight": 0.0,
+                "description": None,
+                "keywords": None,
+                "source_id": None,
+            }
 
     async def get_node_edges(self, source_node_id: str) -> list[tuple[str, str]] | None:
         node_label = source_node_id.strip('"')