diff --git a/Source/History.js b/Source/History.js
index b89c71c..9f7d957 100644
--- a/Source/History.js
+++ b/Source/History.js
@@ -21,7 +21,7 @@ provides: History
 var events = Element.NativeEvents,
 	location = window.location,
 	cleanURL = function(url){
-		if (url.match(/^https?:\/\//)) url = '/' + url.split('/').slice(3).join('/');
+		if (url && url.match(/^https?:\/\//)) url = '/' + url.split('/').slice(3).join('/');
 		return url;
 	},
 	base = cleanURL(location.href),