wprainbow not defined in admin

It looks like the wprainbow initialization script is being called throughout the backend, but the js is only enqueued on the “Settings > Writing” page. So in all other pages there’s a JS error which makes WYSIWYG boxes (like in EDD Emails settings) to break.

Hope a quick fix can be done, it’s an excellent plugin!

https://ww.wp.xz.cn/plugins/wp-rainbow-hilite/