Ok I'm here seeking help for 2 different errors that crash my server. All the details necessary are in the crash reports, so there's no point writing that stuff. The first one very rarely happens when a player joins. http://pastebin.com/Q5CHnJFD The second one seems to happen when a player places a monster spawner that was spawned with /give. http://pastebin.com/EnieQZQX Is this happening to anyone else? Thanks.