From 5ea76e223098238302a13cb122516c3bc793ff48 Mon Sep 17 00:00:00 2001
From: Ralf Becker <ralfbecker@outdoor-training.de>
Date: Wed, 4 Feb 2015 10:37:52 +0000
Subject: [PATCH] fix calendar_groupdav::isParticipant() called with NULL,
 caused by recurring event starts in future behind horizont

---
 calendar/inc/class.calendar_groupdav.inc.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/calendar/inc/class.calendar_groupdav.inc.php b/calendar/inc/class.calendar_groupdav.inc.php
index 5c02dad457..3b54e91539 100644
--- a/calendar/inc/class.calendar_groupdav.inc.php
+++ b/calendar/inc/class.calendar_groupdav.inc.php
@@ -659,6 +659,11 @@ class calendar_groupdav extends groupdav_handler
 				break;
 			}
 		}
+		// if recurring event starts in future behind horizont, nothing will be returned by bo::search()
+		if (!isset($master) && !($master = $this->bo->read($uid)))
+		{
+			return array();
+		}
 		foreach($events as $k => &$recurrence)
 		{
 			//error_log(__FILE__.'['.__LINE__.'] '.__METHOD__."($uid)[$k]:" . array2string($recurrence));