Reload table content using _fnAjaxUpdate

I tried to reload the table content by calling _fnAjaxUpdate function, but after I called that function the table was empty. The table was empty because _fnCalculateEnd( oSettings ) was not called before _fnDraw( oSettings ) in _fnAjaxUpdateDraw ( oSettings, json ). When I modified that, everything worked ok. Could somebody confirm that this is a good fix for the issue or that there is another solution? Thanks.