13:23:37 [SEVERE] Could not pass event EntityDamageByEntityEvent to CombatLog v0.9.7
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.EntityArrow.j_(EntityArrow.java:226)
        at net.minecraft.server.v1_4_6.World.entityJoinedWorld(World.java:1334)
        at net.minecraft.server.v1_4_6.WorldServer.entityJoinedWorld(WorldServer.java:548)
        at net.minecraft.server.v1_4_6.World.playerJoinedWorld(World.java:1315)
        at net.minecraft.server.v1_4_6.World.tickEntities(World.java:1193)
        at net.minecraft.server.v1_4_6.WorldServer.tickEntities(WorldServer.java:445)
        at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:580)
        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 com.jackproehl.combatlog.listeners.EntityDamageByEntityListener.onEntityDamageByEntity(EntityDamageByEntityListener.java:87)
        at sun.reflect.GeneratedMethodAccessor238.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)
        ... 20 more