From 5a148797e1d28188e7885640b3d1514aa76c07c4 Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <machniak@kolabsys.com>
Date: Wed, 29 Jun 2016 19:28:12 +0200
Subject: [PATCH] Fix handling of end date in time_key()

---
 plugins/calendar/drivers/kolab/kolab_user_calendar.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/calendar/drivers/kolab/kolab_user_calendar.php b/plugins/calendar/drivers/kolab/kolab_user_calendar.php
index 07017c4e..c6263147 100644
--- a/plugins/calendar/drivers/kolab/kolab_user_calendar.php
+++ b/plugins/calendar/drivers/kolab/kolab_user_calendar.php
@@ -365,7 +365,7 @@ class kolab_user_calendar extends kolab_calendar
    */
   private function time_key($event)
   {
-    return sprintf('%s/%s', $event['start']->format('U'), is_object($event['end']->format('U')) ?: '0');
+    return sprintf('%s/%s', $event['start']->format('U'), is_object($event['end']) ? $event['end']->format('U') : '0');
   }
 
   /**