diff --git a/js/reveal.js b/js/reveal.js
index 8110afc..25f0dcf 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -3778,10 +3778,12 @@
 	 */
 	function onPreviewLinkClicked( event ) {
 
-		var url = event.target.getAttribute( 'href' );
-		if( url ) {
-			showPreview( url );
-			event.preventDefault();
+		if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
+			var url = event.currentTarget.getAttribute( 'href' );
+			if( url ) {
+				showPreview( url );
+				event.preventDefault();
+			}
 		}
 
 	}