20:26:11 [SEVERE] Could not pass event PlayerJoinEvent to AuthMe
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:303)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:441)
        at net.minecraft.server.ServerConfigurationManager.c(ServerConfiguration
Manager.java:135)
        at net.minecraft.server.NetLoginHandler.b(NetLoginHandler.java:128)
        at net.minecraft.server.NetLoginHandler.a(NetLoginHandler.java:94)
        at net.minecraft.server.Packet1Login.handle(SourceFile:68)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
        at net.minecraft.server.NetLoginHandler.a(NetLoginHandler.java:48)
        at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:6
1)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:554)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:490)
Caused by: java.lang.NullPointerException
        at uk.org.whoami.authme.Utils.setGroup(Utils.java:33)
        at uk.org.whoami.authme.listener.AuthMePlayerListener.onPlayerJoin(AuthM
ePlayerListener.java:425)
        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.ja
va:301)
        ... 12 more