From d59d5a92923a9a3cc6bd3778e11dee12ae5b4a88 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Wed, 28 May 2014 13:36:16 +0000
Subject: [PATCH] Twenty Fourteen: Avoid passing an empty string to
 document.getElementById().

props nabil_kadimi.
fixes #28340.
Built from https://develop.svn.wordpress.org/trunk@28598


git-svn-id: http://core.svn.wordpress.org/trunk@28423 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-content/themes/twentyfourteen/js/functions.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/wp-content/themes/twentyfourteen/js/functions.js b/wp-content/themes/twentyfourteen/js/functions.js
index ea656d8077..3ec30fef0b 100644
--- a/wp-content/themes/twentyfourteen/js/functions.js
+++ b/wp-content/themes/twentyfourteen/js/functions.js
@@ -40,7 +40,13 @@
 	 * @link http://www.nczonline.net/blog/2013/01/15/fixing-skip-to-content-links/
 	 */
 	_window.on( 'hashchange.twentyfourteen', function() {
-		var element = document.getElementById( location.hash.substring( 1 ) );
+		var hash = location.hash.substring( 1 ), element;
+
+		if ( ! hash ) {
+			return;
+		}
+
+		element = document.getElementById( hash );
 
 		if ( element ) {
 			if ( ! /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) {