From b0e06ccdb7837aefcb91e1303fe4bf8f4b111730 Mon Sep 17 00:00:00 2001
From: Thomas Bruederli <bruederli@kolabsys.com>
Date: Wed, 15 Jan 2014 16:32:34 +0100
Subject: [PATCH] Avoid fatal errors in case the event object has invalid date
 properties

---
 plugins/libkolab/lib/kolab_date_recurrence.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/libkolab/lib/kolab_date_recurrence.php b/plugins/libkolab/lib/kolab_date_recurrence.php
index 85ffd912..1dc63bef 100644
--- a/plugins/libkolab/lib/kolab_date_recurrence.php
+++ b/plugins/libkolab/lib/kolab_date_recurrence.php
@@ -118,7 +118,7 @@ class kolab_date_recurrence
         }
 
         // determine a reasonable end date if none given
-        if (!$event['recurrence']['COUNT']) {
+        if (!$event['recurrence']['COUNT'] && $event['start'] instanceof DateTime) {
           switch ($event['recurrence']['FREQ']) {
             case 'YEARLY':  $intvl = 'P100Y'; break;
             case 'MONTHLY': $intvl = 'P20Y';  break;