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grid.deleteColumn(cind) throws exception _cellType not defined

Hello

IE6: crash in "deleteColumn(cind)": exception in line 870 of dhtmlxgrid.js: "_cellType is null or not an object"
cells5:function(cell, type){var type = type||(cell._cellType...
Nevertheless: the column disappears from the Grid, but exception is strange and worries me.

The column was previously inserted dynamically after ajax call:
/**
* Insert a new column with the id given.
* @param id column id.
* @param colElementXML XML element with label,type,width,format.
* @param newColIndex insert the new column after this index.
*/
function insertColumn(id, colElementXML, newColIndex)
{
var label = colElementXML.firstChild.nodeValue;
var type = colElementXML.getAttribute("type");
var width = colElementXML.getAttribute("width");
var mask = colElementXML.getAttribute("format");
alert(id + "," + label + "," + type + "," + width);
bomGrid.insertColumn(newColIndex, label, type, width);
if (mask && mask.length > 0)
{
bomGrid.setNumberFormat(mask, newColIndex,"",".");
}
bomGrid.setColumnId(newColIndex, id);
}

Do you have any idea what could be the root cause for the exception. The column has no colspan, it is a normal column of type "edn" or "ron" (type is set in insertColumn).

Thanks and regards,
Helmut

Column index is correct, the error occurs if deleting a column which was inserted in a loaded Grid with:

bomGrid.insertColumn(newColIndex, label, type, width);

bomGrid.setNumberFormat(mask, newColIndex,".",",");

bomGrid.setColumnId(newColIndex, id);

Later after user request:

var colNum = bomGrid.getColumnsNum();
for (var ccin = 0; ccin < colNum; ccin++) {
   var colId = bomGrid.getColumnId(ccin);
   if (colId && (colId.indexOf("YieldSize_") != -1)) {
       bomGrid.deleteColumn(ccin); // exception occurs
   }
}

The provided code look correct. We need the complete sample to reproduce the issue (it can be sent to support@dhtmlx.com)