Bug Error Using Quick Edit (on Posts with Tags)

I ran into this today while using the Quick Edit function on a new thread with tags:

I've also noticed that quick edit removes the automatic font and alignment feature, so maybe the error has to do with that?

I wouldn't think that it's a quick error specific error. With regular posts and replies, I've had this same "MyBB Internal: etc" error except in an otherwise blank page when posting. In quick reply, I've had the same as Kat's message once, but usually it works fine, just like with regular posts. And in all cases, for me at least, it does post the updated post.