Product variations descriptions are not displayed

-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.6.0
-- PHP version -- : 5.6
-- Browser(s) name and version -- : Firefox
-- Error-message(debug-mod must be tuned on) -- : Product variations descriptions are not displayed when editing product in TinyMCE.

Hi Hika-Team,
I've got a little problem where the description of product variations are not displayed in the backend in the TinyMCE editor. I can still see and edit the content, when I set any other editor like none, Codemirror or JCE. I've solved the issue right now by using JCE, but I would rather use TinyMCE... When clicking the toggle editor button, I get a NS_ERROR_UNEXPECTED error and I un-minified the tinymce.min.js and it then threw me the error on line 4353. (File attached) Maybe you have an idea?

Regards,
Hannes

Seems as if this might be able to help: github.com/tinymce/tinymce/issues/794#issuecomment-232387940