Index: branches/5.2.x/core/units/helpers/priority_helper.php
===================================================================
diff -u -N -r13840 -r14095
--- branches/5.2.x/core/units/helpers/priority_helper.php	(.../priority_helper.php)	(revision 13840)
+++ branches/5.2.x/core/units/helpers/priority_helper.php	(.../priority_helper.php)	(revision 14095)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: priority_helper.php 13086 2010-01-12 19:47:40Z alex $
+* @version	$Id: priority_helper.php 14095 2010-12-28 17:37:07Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -38,8 +38,11 @@
 				$sql .= ' WHERE '.$constrain;
 			}
 
-			if (!isset($object->Fields['OldPriority'])) {
-				$object->VirtualFields['OldPriority'] = Array('type' => 'int', 'default' => 0);
+			if ( !$object->isField('OldPriority') ) {
+				// make sure, then OldPriority field is defined
+				$virtual_fields = $object->getVirtualFields();
+				$virtual_fields['OldPriority'] = Array('type' => 'int', 'default' => 0);
+				$object->setVirtualFields($virtual_fields);
 			}
 
 			$items_count = $this->Conn->GetOne($sql);