From a17a29db81cedac6a186c8ae2b9bf37aeb591121 Mon Sep 17 00:00:00 2001
From: Ralf Becker <RalfBecker@outdoor-training.de>
Date: Mon, 30 Jul 2018 09:51:44 +0200
Subject: [PATCH] fix PHP Warning: Invalid argument supplied for foreach()

---
 calendar/inc/class.calendar_uiviews.inc.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/calendar/inc/class.calendar_uiviews.inc.php b/calendar/inc/class.calendar_uiviews.inc.php
index bd95bb5517..b47d89bc06 100644
--- a/calendar/inc/class.calendar_uiviews.inc.php
+++ b/calendar/inc/class.calendar_uiviews.inc.php
@@ -935,9 +935,12 @@ class calendar_uiviews extends calendar_ui
 		$set_execute = function(&$action) use (&$set_execute)
 		{
 			$action['onExecute'] = 'javaScript:app.calendar.action_merge';
-			foreach($action['children'] as &$child)
+			if (!empty($action['children']))
 			{
-				$set_execute($child);
+				foreach($action['children'] as &$child)
+				{
+					$set_execute($child);
+				}
 			}
 		};
 		$set_execute($actions['documents']);