From d9371e21a0fe2b4df2898c07f59ebefdedeff241 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Tue, 13 Nov 2012 21:08:04 -0500
Subject: [PATCH] null check parentNode in case slide has been detached

---
 js/reveal.js     | 2 +-
 js/reveal.min.js | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/js/reveal.js b/js/reveal.js
index 310672d5..621a85bd 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -749,7 +749,7 @@ var Reveal = (function(){
 
 		// If we were on a vertical stack, remember what vertical index 
 		// it was on so we can resume at the same position when returning
-		if( previousSlide && previousSlide.parentNode.classList.contains( 'stack' ) ) {
+		if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
 			setPreviousVerticalIndex( previousSlide.parentNode, indexv );
 		}
 
diff --git a/js/reveal.min.js b/js/reveal.min.js
index cacff04b..8c09b94d 100644
--- a/js/reveal.min.js
+++ b/js/reveal.min.js
@@ -1,8 +1,8 @@
 /*!
- * reveal.js 2.2 (2012-11-11, 11:51)
+ * reveal.js 2.2 (2012-11-13, 21:07)
  * http://lab.hakim.se/reveal-js
  * MIT licensed
  *
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
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