diff --git a/javascript/TabSet.js b/javascript/TabSet.js
index c09d4a4f4..2d30fcf58 100644
--- a/javascript/TabSet.js
+++ b/javascript/TabSet.js
@@ -24,6 +24,8 @@
 			 */
 			rewriteHashlinks: function() {
 				$(this).find('ul a').each(function() {
+					if (!$(this).attr('href')) return;
+					
 					var matches = $(this).attr('href').match(/#.*/);
 					if(!matches) return;
 					$(this).attr('href', document.location.href.replace(/#.*/, '') + matches[0]);