Frequently getting 'Conversation already has an active response' from realtime API

API
1

While testing the Realtime API function calls, I sent a function_call_output message with conversation.item.create after each function call. Then, I triggered the server response by sending a response.create message.

After a few function calls, the server returned an error:

{
  "type": "error",
  "event_id": "event_xxxxx",
  "error": {
    "type": "invalid_request_error",
    "code": null,
    "message": "Conversation already has an active response",
    "param": null,
    "event_id": null
  }
}

However, the logs show that all previous responses had received response.done messages from the server, indicating that there were no incomplete responses.