15:29:20 [SEVERE] Could not pass event ENTITY_DAMAGE to Mob Stats
java.lang.NullPointerException
        at mobstats.listeners.Entities.onEntityDamage(Entities.java:43)
        at org.bukkit.plugin.java.JavaPluginLoader$64.execute(JavaPluginLoader.j
ava:711)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:58)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:339)
        at net.minecraft.server.EntityWolf.a(EntityWolf.java:345)
        at net.minecraft.server.EntityCreature.m_(EntityCreature.java:70)
        at net.minecraft.server.EntityWolf.m_(EntityWolf.java:96)
        at net.minecraft.server.EntityLiving.d(EntityLiving.java:887)
        at net.minecraft.server.EntityAnimal.d(SourceFile:43)
        at net.minecraft.server.EntityWolf.d(EntityWolf.java:137)
        at net.minecraft.server.EntityLiving.w_(EntityLiving.java:297)
        at net.minecraft.server.EntityWolf.w_(EntityWolf.java:165)
        at net.minecraft.server.World.entityJoinedWorld(World.java:1253)
        at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:1
07)
        at net.minecraft.server.World.playerJoinedWorld(World.java:1235)
        at net.minecraft.server.World.tickEntities(World.java:1142)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:518)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:425)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)