Update app.py

app.py

@@ -342,7 +342,7 @@ with gr.Blocks(css=MODEL_SELECTION_CSS, theme='gradio/soft') as demo:
     )
     
     stop.click(
-        None, None, None,
+        lambda: gr.update(interactive=True), None, regenerate,
         cancels=[send_event, regen_event]
     )