Insert video doesn't work in CKEditor

Problem

It is not posible insert video URL to the editor if you paste url and press Insert button immediatelly. Editor is corrupted then.

Steps to reproduce

1. Open new or update node with WISIWYG editor with Video filter button enabled
2. Press Video filter button
3. Paste any video url i.e. from Youtube
4. Press insert button with mouse directly (without pressing tab or enter)
5. Dialog will close, filter is not inserted and editor shows HTML code without any toolbar (attached image)

When Tab or Enter is pressed in dialog then video settings are shown and Insert button works.