I recieved this error in the console right before a crash when attempting to run my server on #575 build of spigot. Here is the entire server.log from boot to crash. http://pastebin.com/tAK2J3pv There is no minecraft crash report generated as after the final line there the terminal stops responding and the processer usage go to 100%. Attempting to ctrl-c causes a response from the jvm stating the process must be killed. After killing java the terminal and cpu return to normal. Loading the server back the with current RB of craftbukkit loads up without an issue so far and has been running for about 3 hours now. Prior to trying the #575 build of spigot I tried running my server on the RB build and while it did stay up longer than a few seconds after about an hour of running the same error was generated without much of a reason. In that case, again there was no mc crash generated and the terminal locked with cpu at 100%. recreated 3 times after different intervals of running before I tried the most recent (#575) build of spigot. Not sure where to begin looking. for sake of it here's my plugin list: Plugins (40): TuxTwoLib, LagMeter, MultiInv, WorldEdit, NoCheatPlus, SilkierTouch, ShiftMode, Vault, Multiverse-Core, PermissionsEx, Wither, LogBlock, SelfPromote, WorldGuard, ColoredTablist, ModReq, AutoMessage, iConomy, ProperTime, Permissions, CommandHelper, AdvancedBans, ProtocolLib, Modifyworld, PlayerSkulls, Herochat, MobEggs, CleanroomGenerator, Essentials, RegionForSale, TagAPI, Multiverse-SignPortals, Multiverse-NetherPortals, SignShop, LWC, dynmap, MonsterIRC, CraftBook, WorldBorder, VanishNoPacket Thanks for any help you guys can provide.