Update app.py

app.py

@@ -386,7 +386,9 @@ with gr.Blocks(css="constants/styles.css", theme=gr.themes.Soft()) as demo:
         [cur_arxiv_id, local_data, prompt_txtbox, chat_state],
         [prompt_txtbox, chatbot, local_data, close, reset, regen],
         concurrency_limit=20, queue=True
-    ).then(
+    ).
+    
+    chat_event.then(
         None, [cur_arxiv_id, local_data], None, 
         js=UPDATE_CHAT_HISTORY
     )