[16:14:33 ERROR]: Could not pass event EntityDeathEvent to Skills v12.3.1
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot.jar:git-Spigot-eb3d921-b9f1615]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-eb3d921-b9f1615]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:395) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.EntityLiving.die(EntityLiving.java:1116) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.EntitySkeleton.die(EntitySkeleton.java:46) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.EntityLiving.damageEntity(EntityLiving.java:956) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.EntityMonster.damageEntity(EntityMonster.java:44) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.EntityHuman.attack(EntityHuman.java:1005) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.EntityPlayer.attack(EntityPlayer.java:1311) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1621) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.PacketPlayInUseEntity.a(SourceFile:69) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.PacketPlayInUseEntity.a(SourceFile:13) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_191]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_191]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot.jar:git-Spigot-eb3d921-b9f1615]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]
Caused by: java.lang.NullPointerException
        at me.leothepro555.skills.external.MythicMobsManager.getMythicMobName(MythicMobsManager.java:35) ~[?:?]
        at me.leothepro555.skills.external.ExternalHandler.getMythicMobName(ExternalHandler.java:98) ~[?:?]
        at me.leothepro555.skills.level.LevelManager.getCustomXP(LevelManager.java:78) ~[?:?]
        at me.leothepro555.skills.level.LevelManager.onEntityKill(LevelManager.java:134) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor721.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_191]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot.jar:git-Spigot-eb3d921-b9f1615]
        ... 22 more