When I am damaged by Minecraft Vanilla Mobs, errors will occur.

Summary

[MythicMobs] [EVENTS] Exception thrown whilst handling event: org.bukkit.event.entity.EntityDamageByEntityEvent
java.lang.NullPointerException: Cannot invoke "io.lumine.mythic.api.skills.SkillCaster.isUsingDamageSkill()" because "damagerCaster" is null

This error occurs when I am damaged by Minecraft Vanilla Mobs. How can I fix this error?

Steps to reproduce

1. Install MythicMobs
2. Damage by the vanilla mobs

Current behavior

the damage system work correctly, but the bug messages are inundating the console.

Intended correct behavior

the damage system work correctly without a bug messages.

Server log file

https://pastebin.com/cH8rZuV1

Debug log snippet

https://pastebin.com/y5dQmLmZ