VAPI is calling the tool called liveSummary to send the summary details to my API. My API is declared as void return type. It was working fine all these days but giving this error for the past 3 days. I'm receiving the updateds to my API but in logs it is showing the error. How to fix it? https://cdn.discordapp.com/attachments/1430509546304180428/1430509546710892585/image.png?ex=68fa0955&is=68f8b7d5&hm=d5876b15c412463e0b25c7f4d975e0c9951c69aa4bb45ddec6d207bb02a625f8&

To fix the "No result returned" error, update your API to always return the following JSON structure (with HTTP 200), even for void operations:

json
{
  "results": [
    {
      "toolCallId": "call_123",  // Use the actual toolCallId from the request
      "result": "Operation completed successfully"
    }
  ]
}

This will resolve the error and ensure Vapi processes your webhook response correctly. For more details, see the [custom tools troubleshooting guide](https://docs.vapi.ai/tools/custom-tools-troubleshooting#no-result-returned-error). Source: - [Custom tools troubleshooting](https://docs.vapi.ai/tools/custom-tools-troubleshooting)

Message marked as helpful by @kk! 🎉

it was working earlier without any response structure from our side. Why it is not working for past 2 days

Hi, could you please provide a call id where you experienced this issue? We would like to review the logs to identify the cause.

019a115a-d0b1-7dd9-85ae-63eed22339b8

Thank you for providing that call id. We will review the logs and get back to you with our findings