Resize last frozen column failed, please help to fix it

Try to drag the right of last column, that will trigger exception, and can not stop.
http://webix.com/snippet/7620c858

@ chrome and IE

Yep, I can see the issue

Unfortunately it is too late to include the fix in the Webix 2.3.6, so it will be available as a part of a next update.

Thanks!