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Error with latest ACF 3.0

After upgrading to the ACF 3.0 addon we’re getting the following error on our site en masse until the site runs out of memory and gives me a 500 error:

PHP Warning: Trying to access array offset on value of type bool in /sites/ on line 33

This is with the latest version of the main plugin and ACF version 5.12.2.

2 years, 2 months ago
Stefan van den Dungen Gronovius

Hello Steve,

Can you send me your ACF field configuration for the object type where you have the issue?
Please send me the info to

2 years, 1 month ago
Stefan van den Dungen Gronovius

I think I found the issue. Do you maybe have Group fields inside group fields?
In that case, you can change the following file:


You can change it with the following contents:

It will disable the support for group fields inside group fields.
We will investigate this issue further, but I hope this will already help you to solve the issue.

2 years, 1 month ago

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