XF 2.1 WYSIWYG editor not showing up : Uncaught TypeError: Cannot read property 'icon' of undefined

[Jean-Baptiste]

Hello,

I have suddenly an error on my board.
The WYSIWYG editor is not loading anymore :

The strange thing, is that when I disable "editor dropdown" items in here : admin.php?button-manager, it is working back. But I don't have anymore the QUOTE, MEDIA, CODE, etc... buttons.

Here is the error I have in the Chrome Javascript console :

Uncaught TypeError: Cannot read property 'icon' of undefined
    at s.html (editor-compiled.js?_v=face47eb:160)
    at editor-compiled.js?_v=face47eb:7
    at g (editor-compiled.js?_v=face47eb:7)
    at Object.buildList (editor-compiled.js?_v=face47eb:7)
    at editor-compiled.js?_v=face47eb:7
    at p (editor-compiled.js?_v=face47eb:7)
    at Object._init (editor-compiled.js?_v=face47eb:7)
    at s.load (editor-compiled.js?_v=face47eb:7)
    at s.<anonymous> (editor-compiled.js?_v=face47eb:7)
    at HTMLTextAreaElement.i (jquery.min.js:2)

The error is happening on mobile & computer, for every members.

Thanks for the help,
Jean-Baptiste