From a91d531db2c895e41d58f5243af67472a077b1c5 Mon Sep 17 00:00:00 2001
From: Shannon Deminick <sdeminick@gmail.com>
Date: Sat, 23 Feb 2013 01:50:04 +0600
Subject: [PATCH] Fixes very strange issue of FirstOrDefault not actually
 returning 'null' when it is actually null, never seen anything like it and
 PropertyType is not a value type so should be null. real strange.

---
 src/Umbraco.Core/PublishedContentHelper.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Umbraco.Core/PublishedContentHelper.cs b/src/Umbraco.Core/PublishedContentHelper.cs
index ada557d217..765b012164 100644
--- a/src/Umbraco.Core/PublishedContentHelper.cs
+++ b/src/Umbraco.Core/PublishedContentHelper.cs
@@ -77,6 +77,10 @@ namespace Umbraco.Core
                 {
                     var result = applicationContext.Services.ContentTypeService.GetContentType(docTypeAlias);
                     if (result == null) return Guid.Empty;
+                    if (!result.PropertyTypes.Any(x => x.Alias.InvariantEquals(propertyAlias)))
+                    {
+                        return Guid.Empty;
+                    }
                     var property = result.PropertyTypes.FirstOrDefault(x => x.Alias.InvariantEquals(propertyAlias));
                     if (property == null) return Guid.Empty;
                     return property.DataTypeId;