diff --git a/services/chemistry_drive.py b/services/chemistry_drive.py
index d64763f6..225f34d9 100644
--- a/services/chemistry_drive.py
+++ b/services/chemistry_drive.py
@@ -286,6 +286,7 @@ def manifest_overview(bucket=None) -> ManifestOverview:
             if entry.get("name"):
                 record["name"] = entry["name"]
             record["databases"][db] = entry
+    return overview
 
 
 # --- orchestration -------------------------------------------------------------