diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
index ae8f25dc9e..e3f06f8fbc 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
@@ -4285,7 +4285,7 @@ namespace OpenSim.Region.Framework.Scenes
 
         public void aggregateScriptEvents()
         {
-            if (ParentGroup.RootPart == null)
+            if (ParentGroup == null || ParentGroup.RootPart == null)
                 return;
 
             AggregateScriptEvents = 0;