diff --git a/src/Umbraco.Core/Models/ContentType.cs b/src/Umbraco.Core/Models/ContentType.cs
index ac5eeaf2a8..f1842f495f 100644
--- a/src/Umbraco.Core/Models/ContentType.cs
+++ b/src/Umbraco.Core/Models/ContentType.cs
@@ -133,7 +133,9 @@ namespace Umbraco.Core.Models
         internal override void AddingEntity()
         {
             base.AddingEntity();
-            Key = Guid.NewGuid();
+
+            if(Key == Guid.Empty)
+                Key = Guid.NewGuid();
         }
 
         /// <summary>
diff --git a/src/Umbraco.Core/Models/Media.cs b/src/Umbraco.Core/Models/Media.cs
index 44ffeecc89..45c1ebeb62 100644
--- a/src/Umbraco.Core/Models/Media.cs
+++ b/src/Umbraco.Core/Models/Media.cs
@@ -104,7 +104,9 @@ namespace Umbraco.Core.Models
         internal override void AddingEntity()
         {
             base.AddingEntity();
-            Key = Guid.NewGuid();
+
+            if (Key == Guid.Empty)
+                Key = Guid.NewGuid();
         }
 
         /// <summary>
diff --git a/src/Umbraco.Core/Models/MediaType.cs b/src/Umbraco.Core/Models/MediaType.cs
index cacfadf930..e7521b536d 100644
--- a/src/Umbraco.Core/Models/MediaType.cs
+++ b/src/Umbraco.Core/Models/MediaType.cs
@@ -21,7 +21,9 @@ namespace Umbraco.Core.Models
         internal override void AddingEntity()
         {
             base.AddingEntity();
-            Key = Guid.NewGuid();
+
+            if (Key == Guid.Empty)
+                Key = Guid.NewGuid();
         }
 
         /// <summary>