Grid Filtering - Dynamic Loading

Is this a bug?

** Works:

dhtmlx.com/docs/products/dhtmlxG … mages.html

run in console: myGrid.filterBy(1, “A Time to Kill”)

** Throws error:

dhtmlx.com/docs/products/dhtmlxG … fetch.html

run in console: myGrid.filterBy(1, “index is 1”)

In case of the dynamic loading you need to use the server-side filtration.
docs.dhtmlx.com/grid__dynamic_lo … otheserver