From 8960b2d72189c249baf9d0beadaa8f65aa968949 Mon Sep 17 00:00:00 2001
From: Steven Luscher <steveluscher@users.noreply.github.com>
Date: Sun, 12 Jan 2014 23:23:49 -0800
Subject: [PATCH] Protect against exception when onpopstate/onhashchange are
 null

Without this patch, the following will throw an exception:

    router = Router(routes)
    router.configure({
      notfound: function() { router.setRoute('/'); }
    });
    router.init();

In the early stages of page load, `window.onpopstate` and `window.onhashchange` are `null` (in Chrome, anyway).
---
 lib/director/browser.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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();