From acbf2b46da6db6c7181e126ebf75f8e49a8bcfa5 Mon Sep 17 00:00:00 2001
From: nathangray <nathangray.bsc+github@gmail.com>
Date: Mon, 25 Jul 2016 15:06:20 -0600
Subject: [PATCH] Prevent "Parameter must be scalar" error when creating a
 calendar event - thanks @sbourget

---
 calendar/inc/class.calendar_uiforms.inc.php | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/calendar/inc/class.calendar_uiforms.inc.php b/calendar/inc/class.calendar_uiforms.inc.php
index be14c82d13..9b5b1ef53f 100644
--- a/calendar/inc/class.calendar_uiforms.inc.php
+++ b/calendar/inc/class.calendar_uiforms.inc.php
@@ -379,7 +379,13 @@ class calendar_uiforms extends calendar_ui
 							break;
 						case 'participant':
 							foreach($data as $participant)
-							{								// email or rfc822 addresse (eg. "Ralf Becker <ralf@domain.com>")
+							{
+								if (is_null($participant))
+								{
+									continue;
+								}
+								
+								// email or rfc822 addresse (eg. "Ralf Becker <ralf@domain.com>")
 								$email = array();
 								if(preg_match('/^(.*<)?([a-z0-9_.-]+@[a-z0-9_.-]{5,})>?$/i',$participant,$email))
 								{