diff --git a/integrations/chroma/src/haystack_integrations/document_stores/chroma/document_store.py b/integrations/chroma/src/haystack_integrations/document_stores/chroma/document_store.py
index d39158db4..5be6a7938 100644
--- a/integrations/chroma/src/haystack_integrations/document_stores/chroma/document_store.py
+++ b/integrations/chroma/src/haystack_integrations/document_stores/chroma/document_store.py
@@ -428,8 +428,9 @@ def _query_result_to_documents(result: QueryResult) -> List[List[Document]]:
                 }
 
                 # prepare metadata
-                if metadatas := result.get("metadatas"):
-                    document_dict["meta"] = dict(metadatas[i][j])
+                metadatas = result.get("metadatas")
+                if metadatas and metadatas[i][j] is not None:
+                    document_dict["meta"] = metadatas[i][j].copy()
 
                 if embeddings := result.get("embeddings"):
                     document_dict["embedding"] = np.array(embeddings[i][j])