04:22:29 [GRAVE] Could not pass event EntityDamageByEntityEvent to Guardia
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:332)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:462)
        at org.bukkit.craftbukkit.event.CraftEventFactory.callEvent(CraftEventFa
ctory.java:80)
        at org.bukkit.craftbukkit.event.CraftEventFactory.callEntityDamageEvent(
CraftEventFactory.java:364)
        at org.bukkit.craftbukkit.event.CraftEventFactory.handleEntityDamageEven
t(CraftEventFactory.java:386)
        at net.minecraft.server.EntityLiving.damageEntity(EntityLiving.java:591)

        at net.minecraft.server.EntityHuman.damageEntity(EntityHuman.java:595)
        at net.minecraft.server.EntityPlayer.damageEntity(EntityPlayer.java:349)

        at net.minecraft.server.EntityArrow.h_(EntityArrow.java:222)
        at net.minecraft.server.World.entityJoinedWorld(World.java:1239)
        at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:4
98)
        at net.minecraft.server.World.playerJoinedWorld(World.java:1221)
        at net.minecraft.server.World.tickEntities(World.java:1119)
        at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:565)
        at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
        at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.NullPointerException
        at Guardia.GuardiaListener.damage(GuardiaListener.java:49)
        at sun.reflect.GeneratedMethodAccessor116.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.ja
va:330)
        ... 19 more