Update app.py

app.py

@@ -312,7 +312,7 @@ with gr.Blocks() as demo:
 
 
     def process_change(task_id, task):
-        status = task_status[task_id]["status"]
+        status = task_status.get(task_id, {"status":False})["status"]
         if status:
             video_url = task_status[task_id]["url"]
             ret_t2v_btn = gr.Button(visible=True) if task == 't2v' else gr.Button()