When I resize the window I get so now and then the above issue. Please add a check whether "window" is undefined or not.
It is at line number 70738 in de kendo.all.js of version 2018.2.620
We are converting this thread from "feature request" to "bug report" and closing it due to lack of activity.
It's happening to me too!
Any idea on how to fix it, except by editing kendo's code itself?