Facebook Lead Ads error: Error while retrieving: Cannot read properties of undefined (reading 'map')

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Updated at August 20th, 2025

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Causes How to fix Still need help?

You see the error message “Error while retrieving: Cannot read properties of undefined (reading 'map')” when trying to use the New Lead trigger for Facebook Lead Ads. This typically occurs in the Zap editor, but may appear in your Zap history too.

Causes

You’ll see this error if the Form dropdown menu is currently set to “Default (Any Form)” and your Facebook Lead Ads account has insufficient permissions to access all forms associated with your Facebook account.

Screenshot highlighting the Form dropdown menu in the Zap editor for Facebook Lead Ads.png

How to fix

To fix this issue:

Upgrade your Facebook Lead Ads account permissions
Reconnect your Facebook Lead Ads account after you upgrade your permissions.
In your Zap, re-select your form from the dropdown menu.

Note

You must set up separate Zaps for each Facebook Lead Ads form you want to trigger from.

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.

Facebook Lead Ads error: Error while retrieving: Cannot read properties of undefined (reading 'map')

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