diff --git a/langchain/vectorstores/chroma.py b/langchain/vectorstores/chroma.py
index d4a8d63d..2f2b49db 100644
--- a/langchain/vectorstores/chroma.py
+++ b/langchain/vectorstores/chroma.py
@@ -24,7 +24,7 @@ def _results_to_docs_and_scores(results: Any) -> List[Tuple[Document, float]]:
     return [
         # TODO: Chroma can do batch querying,
         # we shouldn't hard code to the 1st result
-        (Document(page_content=result[0], metadata=result[1]), result[2])
+        (Document(page_content=result[0], metadata=result[1] or {}), result[2])
         for result in zip(
             results["documents"][0],
             results["metadatas"][0],