From ca951aa56b9f928d1f1c34f178f7f28bc824b4ec Mon Sep 17 00:00:00 2001
From: Robert Foster <rfoster@refoster.com.au>
Date: Sat, 8 Nov 2014 01:13:17 +1100
Subject: [PATCH] Fix for issue U4-5755 Issue: Multiple mixins with same tab
 cause content node edit crash

---
 src/Umbraco.Web/Models/Mapping/TabsAndPropertiesResolver.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Umbraco.Web/Models/Mapping/TabsAndPropertiesResolver.cs b/src/Umbraco.Web/Models/Mapping/TabsAndPropertiesResolver.cs
index 264d90f36d..81817da200 100644
--- a/src/Umbraco.Web/Models/Mapping/TabsAndPropertiesResolver.cs
+++ b/src/Umbraco.Web/Models/Mapping/TabsAndPropertiesResolver.cs
@@ -211,7 +211,7 @@ namespace Umbraco.Web.Models.Mapping
                 }
                 
                 //then we'll just use the root group's data to make the composite tab
-                var rootGroup = propertyGroups.Single(x => x.ParentId == null);
+                var rootGroup = propertyGroups.First(x => x.ParentId == null);
                 aggregateTabs.Add(new Tab<ContentPropertyDisplay>
                     {
                         Id = rootGroup.Id,