diff --git a/src/backend/langflow/api/v1/chat.py b/src/backend/langflow/api/v1/chat.py
index dd3407d1b..06a2fdda0 100644
--- a/src/backend/langflow/api/v1/chat.py
+++ b/src/backend/langflow/api/v1/chat.py
@@ -155,7 +155,7 @@ async def stream_build(flow_id: str):
                 )
             else:
                 input_keys_response = {
-                    "input_keys": {},
+                    "input_keys": None,
                     "memory_keys": [],
                     "handle_keys": [],
                 }