jochl

add_action( 'pmxe_before_export', 'wp_all_export_before_export', 10, 1 );
 function wp_all_export_before_export( $export_id )
    {
        if ($export_id == 2) {
            $exportRecord = new PMXE_Export_Record();
            $exportRecord->getById($export_id);
            if ( $exportRecord->count == 0){
                $exportRecord->set(array(
                    'triggered'   => 0,
                    'processing'  => 0,
                    'executing'   => 0,
                    'canceled'    => 1,
                    'canceled_on' => date('Y-m-d H:i:s')
                ))->update();	
                die();
            } 
        }
    }

I feel like this should work – but it does not. Triggered via Cron.

	add_action( 'pmxe_before_export', 'wp_all_export_before_export', 10, 1 );
	function wp_all_export_before_export( $export_id )
	{
		// Unless you want this to execute for every export you should check the id here:
		if($export_id == 2){
			$export = new PMXI_Export_Record(); 
			$export->getById($export_id);	 
			if ( !$export->isEmpty() && $export->count < 1 ) {
				echo 'Import skipped because of empty file / < 100 records';  
				// stop import processing 
				die(); 			 
			}	 
			
		}
	}