I tried it on nextTick and it appears to have worked http://jsbin.com/jizoho/1/edit

I was able to use jQuery's .append() without the nextTick as well, but not prepend(). I'm not sure if it's a bug or not but it might help someone out there.

I still have this problem, but then with a directive that reduces the number of children.

I'm implementing a v-ladda directive for 'ladda' buttons (Buttons with built-in loading indicators, https://github.com/hakimel/Ladda). In bind(), it changes the DOM by wrapping all children of a <button> in one <span> (I copied their code).

Wrapping one child works fine, but when wrapping multiple children (even text nodes resulting from newlines, which is annoying) Vue fails with the TypeError again.

See:
http://jsbin.com/cesuwo/edit?html,js,output