diff --git a/experiencemaker/module/summarizer/base_summarizer.py b/experiencemaker/module/summarizer/base_summarizer.py
index 602a501e..a2ccffb3 100644
--- a/experiencemaker/module/summarizer/base_summarizer.py
+++ b/experiencemaker/module/summarizer/base_summarizer.py
@@ -23,7 +23,8 @@ class BaseSummarizer(BaseModel, ABC):
     def execute(self, trajectories: List[Trajectory], workspace_id: str = None, **kwargs) -> List[Experience]:
         experiences: List[Experience] = self._extract_experiences(trajectories, workspace_id=workspace_id, **kwargs)
 
-        nodes: List[VectorStoreNode] = [x.to_vector_store_node() for x in experiences]
-        self.vector_store.insert(nodes, index_name=workspace_id, **kwargs)
+        if experiences:
+            nodes: List[VectorStoreNode] = [x.to_vector_store_node() for x in experiences]
+            self.vector_store.insert(nodes, index_name=workspace_id, **kwargs)
 
         return experiences