Index: branches/5.2.x/core/units/helpers/user_helper.php
===================================================================
diff -u -N -r15664 -r15777
--- branches/5.2.x/core/units/helpers/user_helper.php	(.../user_helper.php)	(revision 15664)
+++ branches/5.2.x/core/units/helpers/user_helper.php	(.../user_helper.php)	(revision 15777)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: user_helper.php 15664 2013-01-10 11:22:47Z alex $
+* @version	$Id: user_helper.php 15777 2013-05-23 17:51:28Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -480,8 +480,7 @@
 			unset($vars['login'], $vars['logout']);
 
 			// merge back url params, because they were ignored if this was "external:" url
-			$vars['pass'] = implode(',', $vars['pass']);
-			$vars = array_merge($vars, $this->event->getRedirectParams());
+			$vars = array_merge($vars, $this->getRedirectParams($vars['pass'], 'pass'));
 
 			$template = $vars['t'];
 			unset($vars['is_virtual'], $vars['t']);
@@ -491,6 +490,29 @@
 		}
 
 		/**
+		 * Returns current event redirect params with given $prefixes injected into 'pass'.
+		 *
+		 * @param array  $prefixes   List of prefixes to inject.
+		 * @param string $pass_name Name of array key in redirect params, containing comma-separated prefixes list.
+		 *
+		 * @return string
+		 * @access protected
+		 */
+		protected function getRedirectParams($prefixes, $pass_name = 'passed')
+		{
+			$redirect_params = $this->event->getRedirectParams();
+
+			if ( isset($redirect_params[$pass_name]) ) {
+				$redirect_prefixes = explode(',', $redirect_params[$pass_name]);
+				$prefixes = array_unique(array_merge($prefixes, $redirect_prefixes));
+			}
+
+			$redirect_params[$pass_name] = implode(',', $prefixes);
+
+			return $redirect_params;
+		}
+
+		/**
 		 * Checks that user is allowed to use super admin mode
 		 *
 		 * @return bool