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when mouse moves over the disable button in grid's cell, show js error that is "parentNode is NULL..."

when mouse moves over the disable button in grid's cell, show js error that is "parentNode is NULL..."

>> over the disable button in grid's cell
It is some kind of custom HTML content in grid's cell or some built-in feature of grid. 
In case of custom HTML content - it must work correctly, unless you are including some table tag as cell values - it may really cause error. 

The next line will not resolve problem, but will disable tooltips, which most probably cause original problem, so it may be used as temporary fix
Add it before creating grid instance

dhtmlXGridObject.prototype._drawTooltip=function(){};