Bukkit

Spigot-1032\\
ZeeSlag v1.2.1\\
Multiverse-Core v2.5-b670

Doing **/zs start arena1** from another world teleported me to the arena. Doing **/zs tpback** threw this error.

<<code>>
2013-07-18 13:16:05 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'zs' in plugin ZeeSlag v1.2.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:190)
        at org.bukkit.craftbukkit.v1_6_R2.CraftServer.dispatchCommand(CraftServer.java:527)
        at net.minecraft.server.v1_6_R2.PlayerConnection.handleCommand(PlayerConnection.java:981)
        at net.minecraft.server.v1_6_R2.PlayerConnection.chat(PlayerConnection.java:892)
        at org.bukkit.craftbukkit.v1_6_R2.entity.CraftPlayer.chat(CraftPlayer.java:238)
        at me.Jucko13.ZeeSlag.ZeeSlagPlayerListener$1.run(ZeeSlagPlayerListener.java:247)
        at org.bukkit.craftbukkit.v1_6_R2.scheduler.CraftTask.run(CraftTask.java:58)
        at org.bukkit.craftbukkit.v1_6_R2.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.IllegalStateException: Asynchronous player tracker clear!
        at net.minecraft.server.v1_6_R2.EntityTrackerEntry.clear(EntityTrackerEntry.java:505)
        at net.minecraft.server.v1_6_R2.EntityTracker.untrackPlayer(EntityTracker.java:196)
        at net.minecraft.server.v1_6_R2.PlayerList.moveToWorld(PlayerList.java:388)
        at org.bukkit.craftbukkit.v1_6_R2.entity.CraftPlayer.teleport(CraftPlayer.java:400)
        at org.bukkit.craftbukkit.v1_6_R2.entity.CraftEntity.teleport(CraftEntity.java:198)
        at me.Jucko13.ZeeSlag.ZeeSlagCommands.TeleportPlayerBack(ZeeSlagCommands.java:2415)
        at me.Jucko13.ZeeSlag.ZeeSlag.onCommand(ZeeSlag.java:488)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
        ... 11 more
<</code>>