diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs b/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs
index 144207fa32..44b76b7ddd 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs
@@ -749,8 +749,12 @@ namespace OpenSim.Region.Framework.Scenes
                     item.GroupID = m_part.GroupID;
 
                 if (item.AssetID == UUID.Zero)
+                    item.AssetID = it.AssetID;
+
+                lock (m_items)
                 {
-                    item.AssetID = m_items[item.ItemID].AssetID;
+                    m_items[item.ItemID] = item;
+                    m_inventorySerial++;
                 }
 
                 m_items[item.ItemID] = item;