id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
13947	Error is thrown when creating spell checker dialog	Tade0		"== Steps to reproduce ==

1. Open CKEditor with Web Spell Checker plugin having the hash d25e33615eb0a6c1a5f887621406108a59f2edbf.
2. Click ""Check spelling"".

== Expected result ==

Dialog is created, no errors.

== Actual result ==

Sometimes there's an ""Object doesn't support property or method 'isVisible'"" error thrown in the console.
Apparently this line:
https://github.com/ckeditor/ckeditor-dev/blob/d277ad1230d5e269a309ece0723eebcd5efd8282/plugins/dialogui/plugin.js#L934
is on top of the stack.

== Other details (browser, OS, CKEditor version, installed plugins) ==

IE11, Win 8.1, CKEditor 4.5.5"	Bug	closed	Normal		UI : Spell Checker		invalid