12:49:53 [SEVERE] Could not pass event EntityDamageByEntityEvent to mcMMO v1.4.06-beta1-b1904
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.EntityArrow.l_(EntityArrow.java:229)
        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.gmail.nossr50.util.skills.CombatUtils.combatChecks(CombatUtils.java:294)
        at com.gmail.nossr50.listeners.EntityListener.onEntityDamageByEntity(EntityListener.java:130)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.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)
        ... 19 more