diff --git a/src/backend/langflow/main.py b/src/backend/langflow/main.py
index 734483317..1702fb8f9 100644
--- a/src/backend/langflow/main.py
+++ b/src/backend/langflow/main.py
@@ -81,7 +81,7 @@ def setup_app(
     if not backend_only and (not static_files_dir or not static_files_dir.exists()):
         raise RuntimeError(f"Static files directory {static_files_dir} does not exist.")
     app = create_app()
-    if not backend_only:
+    if not backend_only and static_files_dir is not None:
         setup_static_files(app, static_files_dir)
     return app