Index: orders_event_handler.php
===================================================================
--- orders_event_handler.php	(revision 13571)
+++ orders_event_handler.php	(working copy)
@@ -1058,7 +1058,9 @@
 
 		if ($event->Special == 'last') {
 			// return last order id (for using on thank you page)
-			return $this->Application->RecallVar('front_order_id');
+			$order_id = $this->Application->RecallVar('front_order_id');
+
+			return $order_id > 0 ? $order_id : FAKE_ORDER_ID; // FAKE_ORDER_ID helps to keep parent filter for order items set in "kDBList::linkToParent"
 		}
 
 		$ses_id = $this->Application->RecallVar( $event->getPrefixSpecial(true) . '_id' );