Index: branches/5.2.x/units/orders/orders_event_handler.php
===================================================================
diff -u -N -r16693 -r16734
--- branches/5.2.x/units/orders/orders_event_handler.php	(.../orders_event_handler.php)	(revision 16693)
+++ branches/5.2.x/units/orders/orders_event_handler.php	(.../orders_event_handler.php)	(revision 16734)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: orders_event_handler.php 16693 2021-08-31 09:24:39Z alex $
+* @version	$Id: orders_event_handler.php 16734 2022-11-09 14:59:47Z alex $
 * @package	In-Commerce
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license	Commercial License
@@ -2219,8 +2219,11 @@
 
 					$shipping_email = $object->GetDBField('ShippingEmail');
 					$email_params['to_email'] = $shipping_email ? $shipping_email : $email_params['_user_email'];
-					$this->Application->emailUser('ORDER.SHIP', null, $email_params);
 
+					if ( strlen($email_params['to_email']) ) {
+						$this->Application->emailUser('ORDER.SHIP', null, $email_params);
+					}
+
 					// inform payment gateway that order was shipped
 					$gw_data = $object->getGatewayData();