diff --git a/memoryscope/storage/llama_index_es_memory_store.py b/memoryscope/storage/llama_index_es_memory_store.py
index 02e0c085..4bd7730e 100644
--- a/memoryscope/storage/llama_index_es_memory_store.py
+++ b/memoryscope/storage/llama_index_es_memory_store.py
@@ -149,5 +149,5 @@ class LlamaIndexEsMemoryStore(BaseMemoryStore):
         Returns:
             MemoryNode: The converted MemoryNode with text and metadata from the NodeWithScore.
         """
-        text_node.metadata["vector"] = text_node.embedding
+        text_node.metadata["vector"] = text_node.embedding if text_node.embedding else []
         return MemoryNode(content=text_node.text, **text_node.metadata)