TypeError: line is null on Firefox

[benbro]

Error on Firefox when there is a selecting all the text and trying to format it.
Only happens when there is a scrollbar in the editor.

TypeError: line is null
line 5848
this.root.scrollTop = line.domNode.offsetTop + line.domNode.offsetHeight - this.root.offsetHeight;  

On http://quilljs.com I'm getting a different error. Probably because the file is minified or served by cloudflare.

TypeError: o is null
cloudfl... > eval (line 2, col 26609)

Steps for Reproduction

1. Visit quilljs.com
2. Select all text in the editor (ctrl+a)
3. Click on the Bold button

Actual behavior: [actual]
javascript error

Platforms:
Firefox 48.0.2 on Windows 7.
(no issue with Chrome)

Version: [version]
1.0.0-rc2