Issue with MCP Server Trigger using Google Calendar (UPDATE function freezes the interface)

[marcossilva]

Hello everyone!
I’m facing an issue when creating an MCP Server Trigger using the Google Calendar tool.
In the UPDATE function, when I try to assign values via AI to the fields, the screen completely freezes, and I have to close and reopen the browser window. However, even after reopening the browser, the problem persists.
It’s important to note that this happens only with the UPDATE function — all other functions (such as CREATE and DELETE) work just fine.
I’ve also tried stopping and restarting the Docker container, but unfortunately, the issue remains.
The n8n version I’m using is 1.116.1.
Has anyone experienced something similar or found a possible fix for this behavior?
Thanks in advance for any help!

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• n8n version:
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• n8n EXECUTIONS_PROCESS setting (default: own, main):
• Running n8n via (Docker):
• Operating system: Ubuntu 22.05.5 LTS

[haimich]

Hey marcossilva, I could replicate the problem with an MCP Server Trigger + Google calendar “Update” tool:

As soon as you hit one of the AI buttons it freezes because a JavaScript error occurs as you can see here:

[haimich]

Indeed the problem has already been reported on n8n’s GitHub page: Google Calendar Tool: UI Freeze When Selecting “Let the Model Define This Parameter” in Update Operation · Issue #20848 · n8n-io/n8n · GitHub

You can click on the “Subscribe” button if you want to get informed on any updates (you need to have a GitHub account for this):

[marcossilva]

Thanks for your help!

[haimich]

No worries!

[bdsc]

I’m having the exact same issue and created this loom to show it. Anyone figured out how to solve this? I’m not super technical