From 984a7f6f721633b2bd0debd7daf7a4ac67ae59d5 Mon Sep 17 00:00:00 2001
From: nathangray <nathangray.bsc+github@gmail.com>
Date: Wed, 18 May 2016 11:30:02 -0600
Subject: [PATCH] Avoid exception if use_time_grid preference is not set

---
 calendar/js/app.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/calendar/js/app.js b/calendar/js/app.js
index b90aac1a5d..357c44f020 100644
--- a/calendar/js/app.js
+++ b/calendar/js/app.js
@@ -3601,7 +3601,10 @@ app.classes.calendar = (function(){ "use strict"; return AppJS.extend(
 		 */
 		granularity: function(state) {
 			var list = egw.preference('use_time_grid','calendar');
-			if(list === 0) return parseInt(egw.preference('interval','calendar')) || 30;
+			if(list === 0 || typeof list === 'undefined')
+			{
+				return parseInt(egw.preference('interval','calendar')) || 30;
+			}
 			if(typeof list == 'string') list = list.split(',');
 			if(!list.indexOf && jQuery.isPlainObject(list))
 			{