diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
index 35986cf5b2..ae8f25dc9e 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
@@ -4285,6 +4285,9 @@ namespace OpenSim.Region.Framework.Scenes
 
         public void aggregateScriptEvents()
         {
+            if (ParentGroup.RootPart == null)
+                return;
+
             AggregateScriptEvents = 0;
 
             // Aggregate script events