diff --git a/lib/director/browser.js b/lib/director/browser.js
index 34519f7..e866bc1 100644
--- a/lib/director/browser.js
+++ b/lib/director/browser.js
@@ -47,7 +47,8 @@ var listener = {
 
   fire: function () {
     if (this.mode === 'modern') {
-      this.history === true ? window.onpopstate() : window.onhashchange();
+      var method = window[this.history === true ? 'onpopstate' : 'onhashchange'];
+      method && method();
     }
     else {
       this.onHashChanged();