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grid.addRow() issue

Hello,

I have a dhtmlxgrid. I have a button which allows add row to this grid and also a button which allows delete rows from the grid.

Most of the time add row works fine but sometimes it gives following error in FireFox3 console -

this.cell.parentNode is null
getTitle()(" ", undefined)dhtmlxgridcell.js (line 40)
setAttribute()(" ")dhtmlxgridcell.js (line 39)
getValue()()dhtmlxgr...d_math.js (line 8)
getValue()()dhtmlxgr...d_math.js (line 11)
ev()()dhtmlxgrid.js (line 647)
ev()()dhtmlxgrid.js (line 647)
getTitle()(" ", undefined)dhtmlxgridcell.js (line 42)
setAttribute()(" ")dhtmlxgridcell.js (line 39)
_fillRow()(tr, ,,,,,,,,,,,,,,,,,,,,,)dhtmlxgrid.js (line 749)
_addRow()(2, ,,,,,,,,,,,,,,,,,,,,,, 1)dhtmlxgrid.js (line 858)
addRow()(2, ",,,,,,,,,,,,,,,,,,,,,", 1)dhtmlxgrid.js (line 866)
addRowBefore()(2, ",,,,,,,,,,,,,,,,,,,,,", 1, undefined, undefined, undefined)dhtmlxtreegrid.js (line 41)
onButtonClick(undefined, undefined)myGrid.js (line 919)
setHTML()(click clientX=378, clientY=56, Object id=Insert className=defaultButton)dhtmlxprotobar.js (line 11)
[Break on this error] this.cell.parentNode.idd,

following is the code -

var rowCount = grid.getRowsNum();
grid.addRow(rowCount+1,",,,,,,,,,,,,,,,,,,,,,",rowCount);

I get the error on addRow. This errors shows up sometimes not consistently.

Can you please help me. Thanks.

the way how you generate IDs are not safe, if rows added|deleted non unique ID can be generated
You can try to use next code instead 

var id = grid.uid();
grid.addRow(id,",,,,,,,,,,,,,,,,,,,,,",-1);