diff --git a/calendar/inc/class.calendar_boupdate.inc.php b/calendar/inc/class.calendar_boupdate.inc.php
index f8b79dd27e..1dea3d12b0 100644
--- a/calendar/inc/class.calendar_boupdate.inc.php
+++ b/calendar/inc/class.calendar_boupdate.inc.php
@@ -247,16 +247,8 @@ class calendar_boupdate extends calendar_bo
 		if ($event['videoconference'] && !empty($event['##videoconference']) && class_exists('EGroupware\\Status\\Videoconference\\Call')
 			&& !EGroupware\Status\Hooks::isVideoconferenceDisabled() && ($videoconferenceResId = \EGroupware\Status\Hooks::getVideoconferenceResourceId()))
 		{
-			$participant_total = 0;
-			foreach(['u','e','c'] as $p_type)
-			{
-				if(is_array($event['participant_types'][$p_type]))
-				{
-					$participant_total += count($event['participant_types'][$p_type]);
-				}
-			}
 			$event['participant_types']['r'][$videoconferenceResId] =
-			$event['participants']['r'.$videoconferenceResId] = 'A'.$participant_total;
+			$event['participants']['r'.$videoconferenceResId] = 'A'.(count($event['participant_types']['u']) + count($event['participant_types']['e']) + count($event['participant_types']['c']));
 		}
 
 		// check for conflicts only happens !$ignore_conflicts AND if start + end date are given
@@ -1140,7 +1132,7 @@ class calendar_boupdate extends calendar_bo
 							$calendar_ical->setSupportedFields('full');	// full iCal fields+event TZ
 							// we need to pass $event[id] so iCal class reads event again,
 							// as event is in user TZ, but iCal class expects server TZ!
-							$ics = $calendar_ical->exportVCal([$cleared_event],
+							$ics = $calendar_ical->exportVCal($cleared_event,
 								'2.0', $method, $cleared_event['recur_date'],
 								'', 'utf-8', $method == 'REPLY' ? $user : 0
 							);