Error (“Cannot read properties of undefined (reading ‘toLowerCase’)

• kazp

• February 12, 2025 at 7:14 am

Hi all, I’m tinkering around with ACF but I’m a basic wordpress user.

I am trying to create a business directory of sorts with two custom post types.

I am getting this error when I create a new post in just one of the post types and try to add in the taxonomy.

“Cannot read properties of undefined (reading ‘toLowerCase’)”

Is there a way to fix this easily?

Probably sounds stilly but as I am at the very early stages of this project, I had tried to ‘start again’. I tried to delete the plugin and but even when I delete, clear cache / database, when I add plugin back in it still shows this error.

Thanks for any insight.