Выводит в лог вот это:
09:01:24 [SEVERE] Could not pass event PlayerQuitEvent to xAuth
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:332)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:462)
at net.minecraft.server.ServerConfigurationManagerAbstract.disconnect(Se
rverConfigurationManagerAbstract.java:213)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:711)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:286)
at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
at net.minecraft.server.ServerConnection.b(SourceFile:35)
at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:583)
at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.NullPointerException
at com.cypherx.xauth.PlayerDataHandler.restoreData(PlayerDataHandler.jav
a:263)
at com.cypherx.xauth.PlayerManager.unprotect(PlayerManager.java:186)
at com.cypherx.xauth.listeners.xAuthPlayerListener.onPlayerQuit(xAuthPla
yerListener.java:123)
at sun.reflect.GeneratedMethodAccessor226.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:330)
... 14 more