2012-12-15 08:28:59 [INFO] norsac321 issued server command: //ulundo
2012-12-15 08:28:59 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command '/ulundo' in plugin UltraLogger v1.6.7
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:502)
	at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:985)
	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:903)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:858)
	at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:290)
	at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:113)
	at net.minecraft.server.ServerConnection.b(SourceFile:39)
	at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
	at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
Caused by: java.lang.NullPointerException
	at org.ultralogger.more.RollbackCommandExecutor.undoThis(RollbackCommandExecutor.java:96)
	at org.ultralogger.more.RollbackCommandExecutor.undo(RollbackCommandExecutor.java:83)
	at org.ultralogger.MainLogger.onCommand(MainLogger.java:80)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
	... 15 more