Js error on wagtailimage plugin

[alejandrogarza]

Hello,
When selecting position and trying to insert an image from the Wagtailtinymce editor I keep on getting this error:

tinymce.jquery.js:13451 Uncaught DOMException: Failed to execute 'setBaseAndExtent' on 'Selection': There is no child at offset 1.
    at Selection.setRng (http://localhost:8000/static/wagtailtinymce/js/vendor/tinymce/tinymce.jquery.js:13451:23)
    at DOMUtils.<anonymous> (http://localhost:8000/static/wagtailtinymce/js/vendor/tinymce/tinymce.jquery.js:26159:16)
    at executeHandlers (http://localhost:8000/static/wagtailtinymce/js/vendor/tinymce/tinymce.jquery.js:315:36)
    at HTMLDocument.nativeHandler (http://localhost:8000/static/wagtailtinymce/js/vendor/tinymce/tinymce.jquery.js:421:7)

I googled a bit about the issue (1, 2, 3) and even though I'm not sure about the cause, everyone keeps recommending to update the js of tinymce. Is it possible that I am doing something wrong or the js error of tinymce needs to be updated(current one is 2 years old) on the wagtailtinymce module?

Note: I current have the noneditable_leave_contenteditable option available.

Thanks!