From c7df74d5d0cdf3b292a1034c9a0bb3007e9e0b23 Mon Sep 17 00:00:00 2001
From: Thomas Bruederli <bruederli@kolabsys.com>
Date: Wed, 18 Feb 2015 10:20:00 +0100
Subject: [PATCH] Fix updating attendees (do not accidentally set exceptions to
 thisandfuture)

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

diff --git a/plugins/calendar/drivers/kolab/kolab_driver.php b/plugins/calendar/drivers/kolab/kolab_driver.php
index ff02fbb4..f2a92698 100644
--- a/plugins/calendar/drivers/kolab/kolab_driver.php
+++ b/plugins/calendar/drivers/kolab/kolab_driver.php
@@ -642,7 +642,7 @@ class kolab_driver extends calendar_driver
   public function update_attendees(&$event, $attendees)
   {
     // for this-and-future updates, merge the updated attendees onto all exceptions in range
-    if (($event['_savemode'] == 'future' && $event['recurrence_id']) || !empty($event['recurrence'])) {
+    if (($event['_savemode'] == 'future' && $event['recurrence_id']) || (!empty($event['recurrence']) && !$event['recurrence_id'])) {
       if (!($storage = $this->get_calendar($event['calendar'])))
         return false;