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&& == “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. (359 Bytes)