diff --git a/lightrag/operate.py b/lightrag/operate.py
index 4d8264bf..88837435 100644
--- a/lightrag/operate.py
+++ b/lightrag/operate.py
@@ -167,7 +167,7 @@ async def _handle_single_entity_extraction(
 
     # Normalize entity name
     entity_name = normalize_extracted_info(entity_name, is_entity=True)
-    
+
     # Check if entity name became empty after normalization
     if not entity_name or not entity_name.strip():
         logger.warning(
@@ -216,20 +216,20 @@ async def _handle_single_relationship_extraction(
     # Normalize source and target entity names
     source = normalize_extracted_info(source, is_entity=True)
     target = normalize_extracted_info(target, is_entity=True)
-    
+
     # Check if source or target became empty after normalization
     if not source or not source.strip():
         logger.warning(
             f"Relationship extraction error: source entity became empty after normalization. Original: '{record_attributes[1]}'"
         )
         return None
-        
+
     if not target or not target.strip():
         logger.warning(
             f"Relationship extraction error: target entity became empty after normalization. Original: '{record_attributes[2]}'"
         )
         return None
-    
+
     if source == target:
         logger.debug(
             f"Relationship source and target are the same in: {record_attributes}"