null check parentNode in case slide has been detached

2012-11-13 21:08:04 -05:00 · 2012-11-13 21:08:04 -05:00 · d9371e21a0
parent ad54b07a84
commit d9371e21a0
2 changed files with 3 additions and 3 deletions
--- 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 );
 		}

--- a/js/reveal.min.js
+++ b/js/reveal.min.js