diff --git a/lib/director/browser.js b/lib/director/browser.js
index 2388b08..0cb812c 100644
--- a/lib/director/browser.js
+++ b/lib/director/browser.js
@@ -181,7 +181,7 @@ var Router = exports.Router = function (routes) {
 };
 
 function hashFor(onChangeEvent) {
-  var newURL = onChangeEvent.newURL;
+  var newURL = onChangeEvent ? onChangeEvent.newURL : null;
   if (newURL) {
       return newURL.replace(/.*#/, '');
   }