19:28:21 [SEVERE] Could not pass event EntityDamageByEntityEvent to GriefPrevention v7.6
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_4_6.event.CraftEventFactory.callEvent(CraftEventFactory.java:81)
    at org.bukkit.craftbukkit.v1_4_6.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:369)
    at org.bukkit.craftbukkit.v1_4_6.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:391)
    at net.minecraft.server.v1_4_6.EntityLiving.damageEntity(EntityLiving.java:686)
    at net.minecraft.server.v1_4_6.EntityHuman.damageEntity(EntityHuman.java:615)
    at net.minecraft.server.v1_4_6.EntityPlayer.damageEntity(EntityPlayer.java:308)
    at net.minecraft.server.v1_4_6.EntityHuman.attack(EntityHuman.java:804)
    at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:1115)
    at net.minecraft.server.v1_4_6.Packet7UseEntity.handle(SourceFile:36)
    at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
    at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
    at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
    at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:598)
    at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
    at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
    at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
    at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
    at me.ryanhamshire.GriefPrevention.EntityEventHandler.onEntityDamage(EntityEventHandler.java:417)
    at sun.reflect.GeneratedMethodAccessor76.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