2013-07-11 12:03:27 [SEVERE] Could not pass event EntityDeathEvent to EnderDragonSMP v1.1
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.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:46)
        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.callEntityDeathEvent(CraftEventFactory.java:346)
        at net.minecraft.server.v1_6_R2.EntityInsentient.dropDeathLoot(EntityInsentient.java:199)
        at net.minecraft.server.v1_6_R2.EntityLiving.die(EntityLiving.java:742)
        at net.minecraft.server.v1_6_R2.EntityLiving.damageEntity(EntityLiving.java:694)
        at net.minecraft.server.v1_6_R2.EntityEnderDragon.dealDamage(EntityEnderDragon.java:502)
        at net.minecraft.server.v1_6_R2.EntityEnderDragon.a(EntityEnderDragon.java:491)
        at net.minecraft.server.v1_6_R2.EntityComplexPart.damageEntity(SourceFile:38)
        at net.minecraft.server.v1_6_R2.EntityArrow.l_(EntityArrow.java:229)
        at net.minecraft.server.v1_6_R2.World.entityJoinedWorld(World.java:1457)
        at net.minecraft.server.v1_6_R2.World.playerJoinedWorld(World.java:1432)
        at net.minecraft.server.v1_6_R2.World.tickEntities(World.java:1304)
        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.gmail.skyshayde.EndListener.onEnderDragonDie(EndListener.java:166)
        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)
        ... 21 more