From cc3e75dc6379bf41cb022f8d7b9ae5af92a83ad6 Mon Sep 17 00:00:00 2001
From: Sebastiaan Janssen <sebastiaan@umbraco.com>
Date: Wed, 18 Apr 2018 15:14:16 +0200
Subject: [PATCH] U4-11208 Error : "An item with the same key has already been
 added." into "Umbraco.Core.Services.IdkMap.Populate" method

---
 src/Umbraco.Core/Services/IdkMap.cs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Umbraco.Core/Services/IdkMap.cs b/src/Umbraco.Core/Services/IdkMap.cs
index 7cf69f2e64..c1981b7b80 100644
--- a/src/Umbraco.Core/Services/IdkMap.cs
+++ b/src/Umbraco.Core/Services/IdkMap.cs
@@ -76,8 +76,9 @@ namespace Umbraco.Core.Services
                 _locker.EnterWriteLock();
                 foreach (var pair in pairs)
                 {
-                    _id2Key.Add(pair.id, new TypedId<Guid>(pair.key, umbracoObjectType));
-                    _key2Id.Add(pair.key, new TypedId<int>(pair.id, umbracoObjectType));
+
+                    _id2Key[pair.id] = new TypedId<Guid>(pair.key, umbracoObjectType);
+                    _key2Id[pair.key] = new TypedId<int>(pair.id, umbracoObjectType);
                 }
             }
             finally