From 89a676a49c49a565657e4d8fc6405f9e9e15f435 Mon Sep 17 00:00:00 2001
From: Yury Delendik <ydelendik@mozilla.com>
Date: Mon, 7 Apr 2014 09:31:04 -0500
Subject: [PATCH] Protects from killing a closed process

---
 test/webbrowser.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/webbrowser.js b/test/webbrowser.js
index 69c6333bb..24d72a757 100644
--- a/test/webbrowser.js
+++ b/test/webbrowser.js
@@ -99,7 +99,9 @@ WebBrowser.prototype = {
       this.callback = callback;
     }
 
-    this.process.kill('SIGTERM');
+    if (this.process) {
+      this.process.kill('SIGTERM');
+    }
   }
 };