id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
16726	Cannot undo after removing uploading image.	kkrzton		"== Steps to reproduce ==

1. Go to http://tests.ckeditor.dev:1030/tests/plugins/uploadwidget/manual/image.
2. Drag and drop 3 images to the editor.
3. Delete 2 of them while images are still uploading.
4. Undo.

== Expected result ==
It is possible to undo changes.

== Actual result ==
Undo does nothing. Error in the console is thrown: `Uncaught TypeError: Cannot read property 'data' of null(…)`.

== Other details (browser, OS, CKEditor version, installed plugins) ==
Checked on Opera and Firefox. Occurs in both browsers."	Bug	confirmed	Normal		General