From 5e85f02eb1596d0c5a71aa35430c0914e0b6d35a Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Sun, 4 May 2014 09:32:10 +0200
Subject: [PATCH] ensure default can be prevented

---
 js/reveal.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/js/reveal.js b/js/reveal.js
index ad332a32..11d6cda3 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -3278,7 +3278,7 @@
 		// If the input resulted in a triggered action we should prevent
 		// the browsers default behavior
 		if( triggered ) {
-			event.preventDefault();
+			event.preventDefault && event.preventDefault();
 		}
 		// ESC or O key
 		else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
@@ -3289,7 +3289,7 @@
 				toggleOverview();
 			}
 
-			event.preventDefault();
+			event.preventDefault && event.preventDefault();
 		}
 
 		// If auto-sliding is enabled we need to cue up