help me 2

2013-05-27 10:59:55 [SEVERE] Could not pass event StatEvent to BackFromTheDead v0.9.4.9
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 me.apollo.backfromthedead.backfromthedeadcore.CoreListener.onEntityDeathStats(CoreListener.java:279)
	at sun.reflect.GeneratedMethodAccessor214.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)
	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_R3.event.CraftEventFactory.callPlayerDeathEvent(CraftEventFactory.java:340)
	at net.minecraft.server.v1_5_R3.EntityPlayer.die(EntityPlayer.java:293)
	at net.minecraft.server.v1_5_R3.EntityLiving.damageEntity(EntityLiving.java:750)
	at net.minecraft.server.v1_5_R3.EntityHuman.damageEntity(EntityHuman.java:684)
	at net.minecraft.server.v1_5_R3.EntityPlayer.damageEntity(EntityPlayer.java:358)
	at net.minecraft.server.v1_5_R3.EntityMonster.m(EntityMonster.java:88)
	at net.minecraft.server.v1_5_R3.EntityZombie.m(EntityZombie.java:139)
	at net.minecraft.server.v1_5_R3.PathfinderGoalMeleeAttack.e(PathfinderGoalMeleeAttack.java:83)
	at net.minecraft.server.v1_5_R3.PathfinderGoalSelector.a(PathfinderGoalSelector.java:104)
	at net.minecraft.server.v1_5_R3.EntityLiving.bo(EntityLiving.java:1508)
	at net.minecraft.server.v1_5_R3.EntityLiving.c(EntityLiving.java:1299)
	at net.minecraft.server.v1_5_R3.EntityMonster.c(EntityMonster.java:20)
	at net.minecraft.server.v1_5_R3.EntityZombie.c(EntityZombie.java:116)
	at net.minecraft.server.v1_5_R3.EntityLiving.l_(EntityLiving.java:526)
	at net.minecraft.server.v1_5_R3.EntityMonster.l_(EntityMonster.java:24)
	at net.minecraft.server.v1_5_R3.EntityZombie.l_(EntityZombie.java:135)
	at net.minecraft.server.v1_5_R3.World.entityJoinedWorld(World.java:1355)
	at net.minecraft.server.v1_5_R3.WorldServer.entityJoinedWorld(WorldServer.java:614)
	at net.minecraft.server.v1_5_R3.World.playerJoinedWorld(World.java:1336)
	at net.minecraft.server.v1_5_R3.World.tickEntities(World.java:1224)
	at net.minecraft.server.v1_5_R3.WorldServer.tickEntities(WorldServer.java:480)
	at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:563)
	at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
	at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
	at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
	at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
	at me.apollo.backfromthedead.backfromthedeadstats.StatisticsMain.checkStats(StatisticsMain.java:156)
	at me.apollo.backfromthedead.backfromthedeadstats.StatisticsMain.onStatChange(StatisticsMain.java:144)
	at sun.reflect.GeneratedMethodAccessor218.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)
	... 37 more