Gmail error: Invalid id value

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Updated at August 20th, 2025

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Cause How to fix it Still need help?

When using Gmail’s Reply in Email action in your Zaps, you see the error message “Invalid id value". You’ll see this error in the details of a Zap run in your Zap's history.

Cause

This happens when the Thread field does not contain the thread ID (a series of numbers and letters), but instead contains text such as:

Full name.
The subject of an email.

How to fix it

If your Zap contains a Gmail trigger, map the Thread ID field as a custom value, from the trigger data, to the Thread field in the Reply in Email action.
If your Zap does not contain a Gmail trigger, you must add a Find Email action step. This will provide you with the Thread ID field associated with the email you want to reply to. You can then use a custom value in the Thread field of your Reply in Email action, to map the Thread ID from the Find Email action step.

Still need help?

If this article did not fix the issue, Zapier has a few other options to get you the help you need:

Contact Zapier Support. Our Support team can investigate your account to find solutions.
Ask in the Zapier Community. Get advice from experienced Zapier users in the Zapier Community.
Learn more about getting help. Read our guide on how to get help and support with Zapier to find the best resources for your specific problem.

Gmail error: Invalid id value

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