Edit trying to activate on node edit form in admin theme

Updated to the latest dev build, which fixed some issues, and now Edit properly offers up a quickedit link and loads properly when I'm looking at pages in my site theme. However, when I actually use the node edit form in the admin theme, edit.js complains on line 212:

TypeError: 'undefined' is not an object (evaluating 'entityElement
.get(0)
.getAttribute')

If it matters, I'm using the Seven theme for admin pages, including for content editing. The main problem is that the javascript error seems to prevent ckeditor from loading up on text fields in the node edit form.