got style error when destroy existed datatable instance

ericxu

I debugged it, and found the length was not identical:

visibleColumns.length
8
headerCells.length
7

the relative code snippets are follows:

        for ( i=0 ; i<visibleColumns.length ; i++ ) {
            column = columns[ visibleColumns[i] ];

            headerCells[i].style.width = column.sWidthOrig !== null && column.sWidthOrig !== '' ?
                _fnStringToCss( column.sWidthOrig ) :
                '';
        }