Error en se connectant

[ThePooN]

Je lance le serveur KTP (pour la première fois), je me connecte, tout se passe bien, sauf que ce message d'erreur apparaît dans la console :
15:46:48 [SEVERE] Could not pass event PlayerJoinEvent to UHPlugin v0.1
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.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at net.minecraft.server.v1_6_R3.PlayerList.c(PlayerList.java:207)
at net.minecraft.server.v1_6_R3.PlayerList.a(PlayerList.java:103)
at net.minecraft.server.v1_6_R3.PendingConnection.e(PendingConnection.java:132)
at net.minecraft.server.v1_6_R3.PendingConnection.d(PendingConnection.java:43)
at net.minecraft.server.v1_6_R3.DedicatedServerConnectionThread.a(DedicatedServerConnectionThread.java:41)
at net.minecraft.server.v1_6_R3.DedicatedServerConnection.b(SourceFile:29)
at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:592)
at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NullPointerException
at me.azenet.UHPlugin.UHPlugin.addToScoreboard(UHPlugin.java:397)
at me.azenet.UHPlugin.UHPluginListener.onPlayerJoin(UHPluginListener.java:95)
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
15:46:48 [WARNING] Ce kit n'existe pas.

Version : UHPlugin v0.1
CraftBukkit version git-Bukkit-1.6.4-R2.0-b2918jnks (MC: 1.6.4) (Implementing API version 1.6.4-R2.0)