Added a "if(entity != null)" before the call to

UpdateEntityMovement() to try to preclude the 
occaisional System.NullReferenceException in scene.

OpenSim/Region/Environment/Scenes/InnerScene.cs

@@ -174,7 +174,9 @@ namespace OpenSim.Region.Environment.Scenes
 
             foreach (EntityBase entity in moveEntities)
             {
-                entity.UpdateMovement();
+                if(entity != null)entity.UpdateMovement();
+                //cfk. This throws occaisional exceptions on a heavily used region
+                //and I added this null check to try to preclude the exception.
             }
         }