Sorry, my fault. The issue was in an Function I use to add CSS class on WYSIWYG iframe wrappers.
I’ve compared the versions of acf-input.js and “mceInit.elements” was removed from the latest version of ACF PRO. That broke my code.
I fixed it by using “mceInit.id” instead of “mceInit.elements”.
Same here. I have multiple WYSIWYG and the bug started after update to Version 5.6.2. It’s a JavaScript bug.
Uncaught TypeError: Cannot read property ‘split’ of undefined
at post.php?post=1778&action=edit&lang=pt-br:2658
at d (acf-input.min.js:1)
at Object.s (acf-input.min.js:1)
at Object.apply_filters (acf-input.min.js:1)
at Object.initialize_tinymce (acf-input.min.js:3)
at Object.initialize (acf-input.min.js:3)
at Object.initialize (acf-input.min.js:3)
at acf-input.min.js:1
at d (acf-input.min.js:1)
at Object.i (acf-input.min.js:1)
post.php?post=1778&action=edit&lang=pt-br:2658
I also think this function should be added to the core plugin. It’s very useful. I’m using @hereswhatidid approach by now. Thanks!