From 2eebc84f2f3b89a7f854ed75b1398fb0ca0b4bdf Mon Sep 17 00:00:00 2001
From: Casey Neehouse <casey@umbraco.com>
Date: Tue, 21 Feb 2012 16:03:46 -0100
Subject: [PATCH] WI# 30472 Placed check on hashtable add to check item has not
 already been added.

---
 umbraco/presentation/umbraco/controls/ContentControl.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/umbraco/presentation/umbraco/controls/ContentControl.cs b/umbraco/presentation/umbraco/controls/ContentControl.cs
index e25746cade..014342b6f8 100644
--- a/umbraco/presentation/umbraco/controls/ContentControl.cs
+++ b/umbraco/presentation/umbraco/controls/ContentControl.cs
@@ -136,7 +136,10 @@ namespace umbraco.controls
                     if (property != null && tabPage != null)
                     {
                         addControlNew(property, tabPage, tab.Caption);
-                        inTab.Add(propertyType.Id.ToString(), true);
+
+                        // adding this check, as we occasionally get an already in dictionary error, though not sure why
+                        if (!inTab.ContainsKey(propertyType.Id.ToString()))
+                            inTab.Add(propertyType.Id.ToString(), true);
                     }
                     else
                     {