Hi @J-I,
Thanks for sharing the screenshot. It looks like the issue is caused by a Custom Function. You can find more details on how to debug it in our Troubleshooting Guide:
For updating Google Sheets, the simplest method is to use the Update Google Sheet block and pass your data in CSV format.
Here’s a quick example you can remix:
https://app.mindstudio.ai/agents/update-google-sheet-3679c61a/remix