Unsure what caused this one. There's a few spider references just before this (I'll attach full log), but I don't see any LUA or pathfinding errors.
[2016-05-09 00:23:53] [DIALOG] CONVERSATION PARTNER: null [2016-05-09 00:23:53] [SERVER][UPDATE] WARNING: object local update of 1448 objects took 79 [2016-05-09 00:23:53] [COMMAND] DESERIALIZE: WARNING (object deserializing toString()): null [2016-05-09 00:23:53] Exiting (normal) because of exception java.lang.NullPointerException [2016-05-09 00:23:53] java.lang.NullPointerException [2016-05-09 00:23:53] at org.schema.schine.network.Command.serialize(SourceFile:220) [2016-05-09 00:23:53] at org.schema.schine.network.server.ServerMessage.serialize(SourceFile:64) [2016-05-09 00:23:53] at org.schema.game.network.objects.remote.RemoteServerMessage.toByteStream(SourceFile:37) [2016-05-09 00:23:53] at org.schema.game.network.objects.remote.RemoteServerMessageBuffer.toByteStream(SourceFile:41) [2016-05-09 00:23:53] at org.schema.schine.network.objects.NetworkObject.getFieldCode(SourceFile:341) [2016-05-09 00:23:53] at org.schema.schine.network.objects.NetworkObject.encode(SourceFile:292) [2016-05-09 00:23:53] at org.schema.schine.network.objects.NetworkObject.encodeChange(SourceFile:709) [2016-05-09 00:23:53] at org.schema.schine.network.synchronization.SynchronizationSender.encodePartialObjectIfChanged(SourceFile:243) [2016-05-09 00:23:53] at org.schema.schine.network.synchronization.SynchronizationSender.encodeNetworkObjects(SourceFile:182) [2016-05-09 00:23:53] at org.schema.schine.network.server.ServerController.synchronize(SourceFile:367) [2016-05-09 00:23:53] at org.schema.game.server.controller.GameServerController.update(SourceFile:1410) [2016-05-09 00:23:53] at org.schema.schine.network.server.ServerController.run(SourceFile:256) [2016-05-09 00:23:53] at java.lang.Thread.run(Thread.java:745) [2016-05-09 00:23:53] [SERVER] SERVER SHUTDOWN. Dumping server State! ... [2016-05-09 00:25:29] [SERVER] SERVER SHUTDOWN. ServerState saved!