returning index only when current fragment is defined

1 files changed, 1 insertions, 1 deletions

diff --git a/js/reveal.js b/js/reveal.js
index 9b7b196..ac1b8b8 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -2050,7 +2050,7 @@ var Reveal = (function(){
 			if( currentSlide ) {
 				var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
 
-				if( visibleFragments ) {
+				if( visibleFragments.length ) {
 					return visibleFragments.length;
 				}
 			}