2013-02-08 20:50:26 [SEVERE] Could not pass event EntityDamageByEntityEvent to Monster Apocalypse v<0.0.1>
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:479)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
	at org.bukkit.craftbukkit.v1_4_R1.event.CraftEventFactory.callEvent(CraftEventFactory.java:81)
	at org.bukkit.craftbukkit.v1_4_R1.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:369)
	at org.bukkit.craftbukkit.v1_4_R1.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:391)
	at net.minecraft.server.v1_4_R1.EntityLiving.damageEntity(EntityLiving.java:699)
	at net.minecraft.server.v1_4_R1.EntityHuman.damageEntity(EntityHuman.java:618)
	at net.minecraft.server.v1_4_R1.EntityPlayer.damageEntity(EntityPlayer.java:309)
	at net.minecraft.server.v1_4_R1.EntityArrow.j_(EntityArrow.java:226)
	at net.minecraft.server.v1_4_R1.World.tickEntity(World.java:1448)
	at net.minecraft.server.v1_4_R1.World.entityJoinedWorld(World.java:1409)
	at net.minecraft.server.v1_4_R1.WorldServer.entityJoinedWorld(WorldServer.java:588)
	at net.minecraft.server.v1_4_R1.World.playerJoinedWorld(World.java:1399)
	at net.minecraft.server.v1_4_R1.World.tickEntities(World.java:1267)
	at net.minecraft.server.v1_4_R1.WorldServer.tickEntities(WorldServer.java:479)
	at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:571)
	at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
	at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:485)
	at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:420)
	at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
	at blainicus.MonsterApocalypse.healthmanager.getLastDamageTime(healthmanager.java:87)
	at blainicus.MonsterApocalypse.DamageListener.onEntityDamage(DamageListener.java:159)
	at sun.reflect.GeneratedMethodAccessor74.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)
	... 21 more