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function deleteGridRows (sidSelected) {

var sidSplit = sidSelected.split(",");

var newLabel;

var http = getHTTPObject();

var direction = "remove";

var instanceID = document.getElementById("instanceid").value;

var usergrid = mytabbar.getActiveTab();

http.open("POST", "/Ajax.go?job=drag&instanceID="+instanceID+"&sid="+sidSelected + "&direction="+direction+"&usergrid="+usergrid, true);

http.onreadystatechange = function () {

if (http.readyState == 4) {

var ret=http.responseText;

if (ret.indexOf("Error") > 0) {

return false;

} else {

for (i=0;i<sidSplit.length;i++) {

if (sidSplit[i].indexOf ('header') == -1 && sidSplit[i].indexOf ('footer') == -1) {

newLabel = grids[mytabbar.getActiveTab()].cells(sidSplit[i],0).getValue();

// alert(sidSplit[i]);

grids[mytabbar.getActiveTab()].deleteRow (sidSplit[i]);   //  <---  when the code reaches this line, the error shows up

mygrid2.addRow(sidSplit[i], newLabel,0);

} else {

grids[mytabbar.getActiveTab()].deleteRow (sidSplit[i]);

}

}

mygrid2.sortRows(0, "strSort", "asc");

updateFooters ();

return true;

}

}

}

http.send();

return true;

}

I used the same code before upgrading the grid to the newest build, and it worked fine as it deletes without error, and also multiple delete at once also worked but after upgrade, when code reaches one line, the error 'this._filter_length' is null or not an object  appears. even though single delete still works but the error breaks the multiple delete. is it something I am doing wrong here? and what can I do to fix it?

Thanks in advance