on player deaths

2013-04-20 12:15:21 [SEVERE] Could not pass event PlayerDeathEvent to MineZ v0.5.1
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.callPlayerDeathEvent(CraftEventFactory.java:339)
	at net.minecraft.server.v1_5_R2.EntityPlayer.die(EntityPlayer.java:282)
	at org.bukkit.craftbukkit.v1_5_R2.entity.CraftLivingEntity.setHealth(CraftLivingEntity.java:77)
	at com.jordair.gmail.MyZ.Listeners.tickListener$2.run(tickListener.java:259)
	at org.bukkit.craftbukkit.v1_5_R2.scheduler.CraftTask.run(CraftTask.java:53)
	at org.bukkit.craftbukkit.v1_5_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
	at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:512)
	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.Listeners.playerDeathListener.onDeath(playerDeathListener.java:37)
	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