diff --git a/kag/builder/component/extractor/schema_free_extractor.py b/kag/builder/component/extractor/schema_free_extractor.py
index 6890adc2..d33b0401 100644
--- a/kag/builder/component/extractor/schema_free_extractor.py
+++ b/kag/builder/component/extractor/schema_free_extractor.py
@@ -512,7 +512,7 @@ def _invoke(self, input: Input, **kwargs) -> List[Output]:
             {k: v for k, v in ent.items() if k in ["name", "category"]}
             for ent in entities
         ]
-        triples = (self.triples_extraction(passage, filtered_entities),)
+        triples = self.triples_extraction(passage, filtered_entities)
         std_entities = self.named_entity_standardization(passage, filtered_entities)
         self.append_official_name(entities, std_entities)
         self.assemble_sub_graph(sub_graph, input, entities, triples)