[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_R2.event.CraftEventFactory.callEvent(CraftEventFactory.java:88)
at org.bukkit.craftbukkit.v1_5_R2.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:376)
at org.bukkit.craftbukkit.v1_5_R2.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:401)
at net.minecraft.server.v1_5_R2.EntityLiving.damageEntity(EntityLiving.java:677)
at net.minecraft.server.v1_5_R2.EntityMonster.damageEntity(EntityMonster.java:39)
at net.minecraft.server.v1_5_R2.EntityHuman.attack(EntityHuman.java:874)
at net.citizensnpcs.npc.ai.MCTargetStrategy.update(MCTargetStrategy.java:117)
at net.citizensnpcs.npc.ai.CitizensNavigator.run(CitizensNavigator.java:114)
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_R2.World.entityJoinedWorld(World.java:1355)
at net.minecraft.server.v1_5_R2.WorldServer.entityJoinedWorld(WorldServer.java:614)
at net.minecraft.server.v1_5_R2.World.playerJoinedWorld(World.java:1336)
at net.minecraft.server.v1_5_R2.World.tickEntities(World.java:1224)
at net.minecraft.server.v1_5_R2.WorldServer.tickEntities(WorldServer.java:480)
at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:562)
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.github.mineGeek.ItemRules.Events.Listeners.onEntityDamage(Listeners.java:396)
at sun.reflect.GeneratedMethodAccessor186.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)
... 23 more