diff --git a/lightrag/operate.py b/lightrag/operate.py
index ee666077..61a095ac 100644
--- a/lightrag/operate.py
+++ b/lightrag/operate.py
@@ -883,23 +883,24 @@ async def _process_extraction_result(
     # Fix LLM output format error which use tuple_delimiter to seperate record instead of "\n"
     fixed_records = []
     for record in records:
+        record = record.strip()
+        if record is None:
+            continue
         entity_records = split_string_by_multi_markers(
             record, [f"{tuple_delimiter}entity{tuple_delimiter}"]
         )
         for entity_record in entity_records:
-            if not entity_record.startswith(
-                f"entity{tuple_delimiter}"
-            ) and not entity_record.startswith(f"relationship{tuple_delimiter}"):
-                entity_record = f"entity{tuple_delimiter}{entity_record}"
+            if not entity_record.startswith("entity") and not entity_record.startswith(
+                "relationship"
+            ):
+                entity_record = f"entity<|{entity_record}"
             entity_relation_records = split_string_by_multi_markers(
                 entity_record, [f"{tuple_delimiter}relationship{tuple_delimiter}"]
             )
             for entity_relation_record in entity_relation_records:
                 if not entity_relation_record.startswith(
-                    f"entity{tuple_delimiter}"
-                ) and not entity_relation_record.startswith(
-                    f"relationship{tuple_delimiter}"
-                ):
+                    "entity"
+                ) and not entity_relation_record.startswith("relationship"):
                     entity_relation_record = (
                         f"relationship{tuple_delimiter}{entity_relation_record}"
                     )