diff --git a/calendar/inc/class.calendar_boupdate.inc.php b/calendar/inc/class.calendar_boupdate.inc.php
index d0d7d2b4ef..8fe7bba507 100644
--- a/calendar/inc/class.calendar_boupdate.inc.php
+++ b/calendar/inc/class.calendar_boupdate.inc.php
@@ -1221,7 +1221,7 @@ class calendar_boupdate extends calendar_bo
 		}
 
 		// create links for new participants from addressbook, if configured
-		if ($cal_id && $GLOBALS['egw_info']['server']['link_contacts'])
+		if ($cal_id && $GLOBALS['egw_info']['server']['link_contacts'] && $event['participants'])
 		{
 			foreach($event['participants'] as $uid => $status)
 			{