Bukkit

What steps will reproduce the problem?
1. configurated the message interval to 10 seconds (although this didn't cause the problem when I first changed it).
2. when a player logs in, he does not get the messages that tell him to register or login, although they still have to and the rest of AuthMe works perfectly fine.

What is the expected output? What do you see instead?
When a player logs in they should get the messages that tells him to register or login.

What version of the product are you using?
version 2.9

Do you have an error log of what happened?(Server console output)

==
2013-08-23 14:31:45 [SEVERE] Could not pass event PlayerJoinEvent to AuthMe v2.9
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
    at net.minecraft.server.v1_6_R2.PlayerList.c(PlayerList.java:208)
    at net.minecraft.server.v1_6_R2.PlayerList.a(PlayerList.java:104)
    at net.minecraft.server.v1_6_R2.PendingConnection.e(PendingConnection.java:136)
    at net.minecraft.server.v1_6_R2.PendingConnection.d(PendingConnection.java:48)
    at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:132)
    at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:592)
    at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:239)
    at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:481)
    at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:413)
    at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.NullPointerException
    at uk.org.whoami.authme.listener.AuthMePlayerListener.onPlayerJoin(AuthMePlayerListener.java:766)
    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 org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    ... 14 more
==

Please provide any additional information below.(config.yml)
This is the 'settings' part of the config file in which I configured the message interval:

settings:
  sessions:
    enabled: false
    timeout: 10
    sessionExpireOnIpChange: false
  restrictions:
    allowChat: false
    allowCommands:
    - /login
    - /register
    - /l
    - /reg
    maxRegPerIp: 1
    maxNicknameLength: 20
    ForceSingleSession: true
    ForceSpawnLocOnJoinEnabled: false
    SaveQuitLocation: true
    AllowRestrictedUser: false
    AllowedRestrictedUser: []
    kickNonRegistered: false
    kickOnWrongPassword: false
    teleportUnAuthedToSpawn: true
    minNicknameLength: 3
    allowMovement: false
    timeout: 0
    allowedNicknameCharacters: '[a-zA-Z0-9_?]*'
    allowedMovementRadius: 100
    enablePasswordVerifier: true
    ProtectInventoryBeforeLogIn: true
    displayOtherAccounts: true
    ForceSpawnOnTheseWorlds:
    - survival
    - survival_nether
    - survival_the_end
    - lobby
    - freebuild
    - hg_lobby
    banUnsafedIP: false
  GameMode:
    ForceSurvivalMode: false
    ResetInventoryIfCreative: false
  security:
    minPasswordLength: 4
    unLoggedinGroup: unLoggedinGroup
    passwordHash: SHA256
    doubleMD5SaltLength: 8
  registration:
    enabled: true
    messageInterval: 10
    force: true
    enableEmailRegistrationSystem: false
    doubleEmailCheck: false
  unrestrictions:
    UnrestrictedName: []
  messagesLanguage: en