diff --git a/src/khoj/routers/indexer.py b/src/khoj/routers/indexer.py
index cd20ab69..de80aed4 100644
--- a/src/khoj/routers/indexer.py
+++ b/src/khoj/routers/indexer.py
@@ -148,7 +148,7 @@ async def update(
 
     logger.info(f"📪 Content index updated via API call by {client} client")
 
-    indexed_filenames = ",".join(file for ctype in index_files for file in index_files[ctype])
+    indexed_filenames = ",".join(file for ctype in index_files for file in index_files[ctype]) or ""
     return Response(content=indexed_filenames, status_code=200)