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Error when I move up on first row

Dear Sir/Madam

When I have the first row of my grid (both treeGrid and normal grid) selected and I press up on my keyboard i get the error:

style.display is empty or not an object.

It's in the dhtmlxgrid.js file on line 1596;
if (r&&r.style.display == "none")

I got it with several different grids both treegrid and normal grid.

What can I do to fix this?

Problem confirmed. Updated build will be available in nearest time. 
As fast solution - please add the code from the attached patch to your page, it will fix issue in grid.