Compatibility issue with next NextGEN Gallery

I noticed that on WP 4.0 combined with NextGEN Gallery the newsletter plugin triggers two js errors on the newsletter template editor.

I disabled all other plugins, so it has to be a conflict with NextGEN Gallery.

TypeError: tinyMCE.activeEditor is null

Line 113

ReferenceError: jQuery is not defined

Line 240

Because of the errors the auto updating of the new images in the preview breaks. Any ideas on how to prevent the js errors?