diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Inventory/LocalInventoryServiceConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Inventory/LocalInventoryServiceConnector.cs
index d3ef08d4f6..1c83f8eb49 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Inventory/LocalInventoryServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Inventory/LocalInventoryServiceConnector.cs
@@ -188,8 +188,11 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Inventory
             Util.FireAndForget(delegate
             {
                 if (UserManager != null)
-                    foreach (InventoryItemBase item in invCol.Items)
+                {
+                    // Protect ourselves against the caller subsequently modifying the items list
+                    foreach (InventoryItemBase item in new List<InventoryItemBase>(invCol.Items))
                         UserManager.AddUser(item.CreatorIdAsUuid, item.CreatorData);
+                }
             });
 
             return invCol;
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Inventory/RemoteXInventoryServiceConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Inventory/RemoteXInventoryServiceConnector.cs
index eb907749d9..c9c716cec7 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Inventory/RemoteXInventoryServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Inventory/RemoteXInventoryServiceConnector.cs
@@ -196,8 +196,11 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Inventory
             Util.FireAndForget(delegate
             {
                 if (UserManager != null)
-                    foreach (InventoryItemBase item in invCol.Items)
+                {
+                    // Protect ourselves against the caller subsequently modifying the items list
+                    foreach (InventoryItemBase item in new List<InventoryItemBase>(invCol.Items))
                         UserManager.AddUser(item.CreatorIdAsUuid, item.CreatorData);
+                }
             });
 
             return invCol;