From 676070dddc0a9c094ad2a6ed789cfc12f7189f8e Mon Sep 17 00:00:00 2001
From: Jake Ginnivan <jake.ginnivan@readify.net>
Date: Wed, 31 Jul 2013 11:09:32 +0100
Subject: [PATCH] Trying to track down this null reference exeception

---
 .../AutomationElementSearch/AutomationElementFinder.cs          | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/TestStack.White/AutomationElementSearch/AutomationElementFinder.cs b/src/TestStack.White/AutomationElementSearch/AutomationElementFinder.cs
index 1e0d8687..0d3a37ce 100644
--- a/src/TestStack.White/AutomationElementSearch/AutomationElementFinder.cs
+++ b/src/TestStack.White/AutomationElementSearch/AutomationElementFinder.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Windows.Automation;
@@ -14,6 +15,7 @@ public class AutomationElementFinder
 
         public AutomationElementFinder(AutomationElement automationElement)
         {
+            if (automationElement == null) throw new ArgumentNullException("automationElement");
             this.automationElement = automationElement;
         }