Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
  at Db4objects.Db4o.Internal.HandlerRegistry.ArrayType (System.Object a_object) [0x00000]
  at Db4objects.Db4o.Internal.ClassMetadata.Delete1 (Db4objects.Db4o.Internal.Marshall.MarshallerFamily mf, Db4objects.Db4o.Internal.Marshall.ObjectHeaderAttributes attributes, Db4objects.Db4o.Internal.StatefulBuffer a_bytes, System.Object a_object) [0x00000]
  at Db4objects.Db4o.Internal.ClassMetadata.Delete (Db4objects.Db4o.Internal.StatefulBuffer a_bytes, System.Object a_object) [0x00000]
  at Db4objects.Db4o.Internal.LocalObjectContainer.Delete4 (Db4objects.Db4o.Internal.Transaction ta, Db4objects.Db4o.Internal.ObjectReference yo, Int32 a_cascade, Boolean userCall) [0x00000]
  at Db4objects.Db4o.Internal.PartialObjectContainer.Delete3 (Db4objects.Db4o.Internal.Transaction trans, Db4objects.Db4o.Internal.ObjectReference ref, Int32 cascade, Boolean userCall) [0x00000]
  at Db4objects.Db4o.Internal.LocalTransaction+_AnonymousInnerClass410.Visit (System.Object a_object) [0x00000]
  at Db4objects.Db4o.Foundation.Tree.Traverse (IVisitor4 a_visitor) [0x00000]
  at Db4objects.Db4o.Internal.LocalTransaction.ProcessDeletes () [0x00000]
  at Db4objects.Db4o.Internal.PartialObjectContainer.Delete (Db4objects.Db4o.Internal.Transaction trans, System.Object obj) [0x00000]
  at Db4objects.Db4o.Internal.PartialObjectContainer.Delete (System.Object a_object) [0x00000]
  at OpenSim.Config.SimConfigDb4o.DbSimConfig.SaveMap (System.Single[] heightmap) [0x00000]
  at OpenSim.world.World.RegenerateTerrain (Boolean changes, Int32 pointx, Int32 pointy) [0x00000]
  at OpenSim.SimClient.ProcessInPacket (libsecondlife.Packets.Packet Pack) [0x00000]
  at OpenSim.SimClient.ClientLoop () [0x00000]
  at OpenSim.SimClient.AuthUser () [0x00000]
  at (wrapper delegate-invoke) System.MulticastDelegate:invoke_void ()
Sending PacketAck