diff --git a/calendar/inc/class.uicalendar.inc.php b/calendar/inc/class.uicalendar.inc.php
index 859f291cb8..b26a8ec588 100755
--- a/calendar/inc/class.uicalendar.inc.php
+++ b/calendar/inc/class.uicalendar.inc.php
@@ -1243,7 +1243,7 @@
 					$this->bo->set_class(True);
 				}
 				// Add participants
-				$participants = explode(";", $GLOBALS['phpgw_session']['phpgw_app_sessions']["calendar"]["participants"]['content']);
+				$participants = explode(";", $GLOBALS['phpgw']->session->appsession("participants") );
 				for($_f_part=0; $_f_part<count($participants); $_f_part++)
 				{
 					$this->bo->add_attribute('participants','A',$participants[$_f_part]);