Update app.py

app.py

@@ -10,7 +10,8 @@ dashscope.api_key = YOUR_API_TOKEN
 def add_text(chatbot, task_history, input):
     """Add text to the chat history."""
     task_history.append({"role": "user", "content": [{"text": input.text}]})
-    task_history.append({"role": "user", "content": [{"audio": input.files[0].path}]})
+    if len (input.files) > 0:
+        task_history.append({"role": "user", "content": [{"audio": input.files[0].path}]})
     chatbot.append([{
         "text": input.text,
         "files": input.files,