Update app_dialogue.py

app_dialogue.py

@@ -682,7 +682,7 @@ with gr.Blocks(title="IDEFICS Playground", theme=gr.themes.Base()) as demo:
         return chat_update, text_update
     def remove_last_turn(chat_history):
         if len(chat_history) == 0:
-            return None, None
+            return gr.update(), gr.update()
         last_interaction = chat_history[-1]
         chat_history = chat_history[:-1]
         chat_update = gr.update(value=chat_history)