After refresh all dataTable functions return null

I am getting a weird error after reloading dataTable, most functions returns null.
I tried 'table.fnDestroy' then 'table.datatable()' but no luck.

Here is the code

var oTable = $('#sample_table').dataTable();

var nRow = $(this).parents('tr')[0];
var aData = oTable.fnGetData(nRow); //works

After table reload

var nRow = $(this).parents('tr')[0];
var aData = oTable.fnGetData(nRow); //returns null

Here is a test case showing the issue : http://jsfiddle.net/smith000monday/GXjks/

Any Ideas?

Thanks.