zombie giant jump bug

2013-04-22 14:09:52 [SEVERE] Could not pass event ProjectileHitEvent to MineZ v0.6.1
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 org.bukkit.craftbukkit.v1_5_R2.event.CraftEventFactory.callProjectileHitEvent(CraftEventFactory.java:579)
	at net.minecraft.server.v1_5_R2.EntityProjectile.l_(EntityProjectile.java:159)
	at net.minecraft.server.v1_5_R2.World.entityJoinedWorld(World.java:1355)
	at net.minecraft.server.v1_5_R2.WorldServer.entityJoinedWorld(WorldServer.java:614)
	at net.minecraft.server.v1_5_R2.World.playerJoinedWorld(World.java:1336)
	at net.minecraft.server.v1_5_R2.World.tickEntities(World.java:1224)
	at net.minecraft.server.v1_5_R2.WorldServer.tickEntities(WorldServer.java:480)
	at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:562)
	at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:225)
	at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:476)
	at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:409)
	at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
	at com.jordair.gmail.MyZ.utils.Utils.attractZombies(Utils.java:1157)
	at com.jordair.gmail.MyZ.Listeners.zombieListener.onProjectileHit(zombieListener.java:83)
	at sun.reflect.GeneratedMethodAccessor53.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)
	... 15 more