1 files changed, 6 insertions, 2 deletions

diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
index 994b9e3..b655f39 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
@@ -330,8 +330,12 @@ namespace OpenSim.Region.Framework.Scenes
             get { return m_rootPart.UUID; }
             set 
             {
-                m_rootPart.UUID = value;
-                m_parts.AddOrReplace(value, m_rootPart);
+                lock (m_parts.SyncRoot)
+                {
+                    m_parts.Remove(m_rootPart.UUID);
+                    m_rootPart.UUID = value;
+                    m_parts.Add(value, m_rootPart);
+                }
             }
         }