Hmm need a bit o help here (Bad Bans)

18:18:20 [SEVERE] Could not pass event PLAYER_QUIT to PermissionsBukkit
java.lang.IllegalArgumentException: Attachment cannot be null
at org.bukkit.permissions.PermissibleBase.removeAttachment(PermissibleBase.java:134)
at org.bukkit.craftbukkit.entity.CraftHumanEntity.removeAttachment(CraftHumanEntity.java:104
)
at com.platymuus.bukkit.permissions.PermissionsPlugin.unregisterPlayer(PermissionsPlugin.jav
a:137)
at com.platymuus.bukkit.permissions.PlayerListener.onPlayerQuit(PlayerListener.java:24)
at org.bukkit.plugin.java.JavaPluginLoader$2.execute(JavaPluginLoader.java:251)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:58)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:338)
at net.minecraft.server.ServerConfigurationManager.disconnect(ServerConfigurationManager.jav
a:146)
at net.minecraft.server.NetServerHandler.disconnect(NetServerHandler.java:121)
at org.bukkit.craftbukkit.entity.CraftPlayer.kickPlayer(CraftPlayer.java:139)
at com.sk89q.commandbook.commands.ModerationCommands.ban(ModerationCommands.java:170)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sk89q.minecraft.util.commands.CommandsManager.executeMethod(CommandsManager.java:343)
at com.sk89q.minecraft.util.commands.CommandsManager.execute(CommandsManager.java:256)
at com.sk89q.commandbook.CommandBookPlugin.onCommand(CommandBookPlugin.java:245)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:35)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:129)
at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:352)
at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:737)
at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:701)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:694)
at net.minecraft.server.Packet3Chat.a(Packet3Chat.java:33)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:89)
at net.minecraft.server.NetworkListenThread.a(SourceFile:105)
at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:454)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:363)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)
18:18:21 [INFO] KICKED: MrCyberMonkey (127.0.0.1) kicked player 'sheynathre': Banned!
18:18:21 [INFO] BAN: MrCyberMonkey (127.0.0.1) banned name 'sheynathre': Banned!
18:18:24 [INFO] sheynathre [/216.121.252.192:49450] logged in with entity id 3085 at ([world] -461.7
7022594418844, 92.0, -235.3494501325334)
18:18:24 [INFO] connect from ip 216.121.252.192
18:18:27 [INFO] High_Prince_Naellon: hmm
18:18:31 [INFO] UNBAN: MrCyberMonkey (127.0.0.1) unbanned name 'sheynathre': Unbanned!
>

 

Make sure you have the latest version of PermissionsBukkit.