IR Error 01

18:18:03 [SEVERE] Could not pass event EntityDamageByEntityEvent to ItemRules v1.0.8
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_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:89)
        at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:377)
        at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:402)
        at net.minecraft.server.v1_5_R3.EntityLiving.damageEntity(EntityLiving.java:677)
        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.EntityHuman.attack(EntityHuman.java:874)
        at net.citizensnpcs.npc.ai.MCTargetStrategy.update(MCTargetStrategy.java:122)
        at net.citizensnpcs.npc.ai.CitizensNavigator.run(CitizensNavigator.java:115)
        at net.citizensnpcs.npc.CitizensNPC.update(CitizensNPC.java:220)
        at net.citizensnpcs.npc.entity.EntityHumanNPC.l_(EntityHumanNPC.java:160)
        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 com.github.mineGeek.ItemRules.Events.Listeners.onEntityDamage(Listeners.java:396)
        at sun.reflect.GeneratedMethodAccessor300.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)
        ... 24 more