2013-07-28 01:06:02 [SEVERE] Could not pass event PlayerDeathEvent to Killreward v1.6.5
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 org.bukkit.craftbukkit.v1_6_R2.event.CraftEventFactory.callPlayerDeathEvent(CraftEventFactory.java:363)
        at net.minecraft.server.v1_6_R2.EntityPlayer.die(EntityPlayer.java:300)
        at net.minecraft.server.v1_6_R2.EntityLiving.damageEntity(EntityLiving.java:694)
        at net.minecraft.server.v1_6_R2.EntityHuman.damageEntity(EntityHuman.java:715)
        at net.minecraft.server.v1_6_R2.EntityPlayer.damageEntity(EntityPlayer.java:371)
        at net.minecraft.server.v1_6_R2.EntityMonster.m(EntityMonster.java:79)
        at net.minecraft.server.v1_6_R2.EntityZombie.m(EntityZombie.java:189)
        at net.minecraft.server.v1_6_R2.EntityMonster.a(EntityMonster.java:105)
        at net.minecraft.server.v1_6_R2.EntityCreature.bk(EntityCreature.java:66)
        at net.minecraft.server.v1_6_R2.EntityLiving.c(EntityLiving.java:1402)
        at net.minecraft.server.v1_6_R2.EntityInsentient.c(EntityInsentient.java:303)
        at net.minecraft.server.v1_6_R2.EntityMonster.c(EntityMonster.java:20)
        at net.minecraft.server.v1_6_R2.EntityZombie.c(EntityZombie.java:123)
        at net.minecraft.server.v1_6_R2.EntityLiving.l_(EntityLiving.java:1261)
        at net.minecraft.server.v1_6_R2.EntityInsentient.l_(EntityInsentient.java:147)
        at net.minecraft.server.v1_6_R2.EntityMonster.l_(EntityMonster.java:24)
        at net.minecraft.server.v1_6_R2.EntityZombie.l_(EntityZombie.java:185)
        at net.minecraft.server.v1_6_R2.EntityPigZombie.l_(EntityPigZombie.java:50)
        at net.minecraft.server.v1_6_R2.World.entityJoinedWorld(World.java:1469)
        at net.minecraft.server.v1_6_R2.World.playerJoinedWorld(World.java:1444)
        at net.minecraft.server.v1_6_R2.World.tickEntities(World.java:1316)
        at net.minecraft.server.v1_6_R2.WorldServer.tickEntities(WorldServer.java:517)
        at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:571)
        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 com.alexander9907.killreward.PlayerListener.onKill(PlayerListener.java:23)
        at sun.reflect.GeneratedMethodAccessor398.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 31 more