Notice: Undefined index: export

Not an urgent request, but please fix the following warning in your next update for those of us that display warnings on the front-end:
“Notice: Undefined index: export in /wp-content/plugins/simple-csv-xls-exporter/simple-csv-xls-exporter.php on line 40”

In the constructor:

public function __construct()   {
   require_once(sprintf("%s/settings.php", dirname(__FILE__)));
   if ( isset( $_GET[ 'export' ] ) && $_GET[ 'export' ] == 'csv' || $_GET[ 'export' ] == 'xls') {
     add_action('wp_loaded', 'ccsve_export');
   }
   $SIMPLE_CSV_EXPORTER_SETTINGS = new SIMPLE_CSV_EXPORTER_SETTINGS();
 }

The “if” conditions should be:
if ( isset( $_GET[ 'export' ] ) && ( $_GET[ 'export' ] == 'csv' || $_GET[ 'export' ] == 'xls' ) )

Thanks.