diff --git a/src/agora/io/metadata.py b/src/agora/io/metadata.py
index 025075024756d98ba907ddfbe753dc0946dad286..713c6d1682ed202f6fdc1cdbc66287060abb68b5 100644
--- a/src/agora/io/metadata.py
+++ b/src/agora/io/metadata.py
@@ -69,7 +69,7 @@ def flatten_dict(nested_dict, separator="/"):
     """
     df = pd.json_normalize(nested_dict, sep=separator)
 
-    flattened = df.to_dict(orient="records") or {}
+    flattened = df.to_dict(orient="records")[0] or {}
     return flattened