Visual Editor Error on WP 4.9.6

Replies: 2

Since upgrading WordPress to 4.9.6, I can’t use the visual editor. Every time I want to move from Text Editor to Visual Editor, this error message appears in the editor:

<span data-mce-type = "bookmark" style = "display: inline-block; width: 0px; overflow: hidden; line-height: 0;" class = "mce_SELRES_start"> </ span>

Through the ‘Health Check’ plugin, I’ve tried disabling all plugins and using default themes, but the above error still happens.

Then I try to check using Google Chrome DevTools (F12), the following error message appears:

Uncaught TypeError: Cannot read property 'controlManager' of undefined
    at patchEditor (plugin.js?ver=4711-20180425:14)
    at Object.<anonymous> (plugin.js?ver=4711-20180425:25)
    at b.e [as fire] (tinymce.min.js?ver=4711-20180425:6)
    at Object.fire (tinymce.min.js?ver=4711-20180425:6)
    at new q (tinymce.min.js?ver=4711-20180425:14)
    at g (tinymce.min.js?ver=4711-20180425:14)
    at Array.<anonymous> (tinymce.min.js?ver=4711-20180425:14)
    at b (tinymce.min.js?ver=4711-20180425:1)
    at k (tinymce.min.js?ver=4711-20180425:14)
    at h.l.bind (tinymce.min.js?ver=4711-20180425:1)

Until now I haven’t been able to solve this problem. Does anyone have the same problem and how to solve it?