2 files changed, 20 insertions, 1 deletions

diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index 4daabd2..9b31fac 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -2006,6 +2006,7 @@ namespace OpenSim.Region.Framework.Scenes
         /// If true, the object is made persistent into the scene.
         /// If false, the object will not persist over server restarts
         /// </param>
+        /// <returns>true if the object was added.  false if not</returns>
         public bool AddNewSceneObject(SceneObjectGroup sceneObject, bool attachToBackup)
         {
             return AddNewSceneObject(sceneObject, attachToBackup, true);
@@ -2023,6 +2024,7 @@ namespace OpenSim.Region.Framework.Scenes
         /// If true, updates for the new scene object are sent to all viewers in range.
         /// If false, it is left to the caller to schedule the update
         /// </param>
+        /// <returns>true if the object was added.  false if not</returns>
         public bool AddNewSceneObject(SceneObjectGroup sceneObject, bool attachToBackup, bool sendClientUpdates)
         {           
             if (m_sceneGraph.AddNewSceneObject(sceneObject, attachToBackup, sendClientUpdates))
diff --git a/OpenSim/Region/Framework/Scenes/SceneGraph.cs b/OpenSim/Region/Framework/Scenes/SceneGraph.cs
index ea2caaf..aecca27 100644
--- a/OpenSim/Region/Framework/Scenes/SceneGraph.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneGraph.cs
@@ -395,11 +395,28 @@ namespace OpenSim.Region.Framework.Scenes
         /// </returns>
         protected bool AddSceneObject(SceneObjectGroup sceneObject, bool attachToBackup, bool sendClientUpdates)
         {
-            if (sceneObject == null || sceneObject.RootPart.UUID == UUID.Zero)
+            if (sceneObject == null)
+            {
+                m_log.ErrorFormat("[SCENEGRAPH]: Tried to add null scene object");
+                return false;
+            }
+            if (sceneObject.UUID == UUID.Zero)
+            {
+                m_log.ErrorFormat(
+                    "[SCENEGRAPH]: Tried to add scene object {0} to {1} with illegal UUID of {2}",
+                    sceneObject.Name, m_parentScene.RegionInfo.RegionName, UUID.Zero);
+                
                 return false;
+            }
 
             if (Entities.ContainsKey(sceneObject.UUID))
+            {
+//                m_log.DebugFormat(
+//                    "[SCENEGRAPH]: Scene graph for {0} already contains object {1} in AddSceneObject()",
+//                    m_parentScene.RegionInfo.RegionName, sceneObject.UUID);
+                
                 return false;
+            }
             
 //            m_log.DebugFormat(
 //                "[SCENEGRAPH]: Adding scene object {0} {1}, with {2} parts on {3}",