From d9371e21a0fe2b4df2898c07f59ebefdedeff241 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab
Date: Tue, 13 Nov 2012 21:08:04 -0500
Subject: null check parentNode in case slide has been detached

---
 js/reveal.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'js/reveal.js')

diff --git a/js/reveal.js b/js/reveal.js
index 310672d..621a85b 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 );
 		}
 
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