TinyMCE is not loading when set as ACF field

• Flaschenzug

• May 15, 2025 at 7:20 am

I added a TinyMCE field for a page within ACF.
When editing the page, most of the time the editor (TinyMCE) is not displayed. So I always have to switch to HTML view to see the content. When reloading the page, sometimes it works. Sometimes not.

I am using the newest WordPress and ACF version.

Other probably relevant plugins:

• Autoptimize
• Yoast
• Query Monitor

Query Monitor doesn’t show any errors.
For testing purposes I deactivated Autoptimize, same issue.

Console output:
Console Output: Uncaught TypeError: n is null

Debugger: // Source: wp-includes/js/tinymce/tinymce.min.js
// 4.9.11 (2020-07-13)

I experienced this issue on multiple sites for some time now. They all use the same Theme (own creation). Maybe it is theme related even if I have no idea how it could be?

Thanks for your help 🙂

• hover

• June 2, 2025 at 11:02 am

We experience the exact same problem