From 0c6997b160d88b7c4105c3574b1758944ebd4a22 Mon Sep 17 00:00:00 2001
From: Cheng Zhao <zcbenz@gmail.com>
Date: Thu, 27 Jun 2013 19:18:31 +0800
Subject: [PATCH] Fix passing null as window in dialog.showMessageBox.

---
 browser/api/lib/dialog.coffee | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/browser/api/lib/dialog.coffee b/browser/api/lib/dialog.coffee
index fa606e1ddbdd..59568bcf5b4e 100644
--- a/browser/api/lib/dialog.coffee
+++ b/browser/api/lib/dialog.coffee
@@ -31,7 +31,7 @@ module.exports =
     binding.showSaveDialog window, options.title, options.defaultPath
 
   showMessageBox: (window, options) ->
-    if window?.constructor isnt BrowserWindow
+    if window? and window.constructor isnt BrowserWindow
       options = window
       window = null