Bug: Exception spam (this spams continue on the server)

Enter a brief description of what is broken Exception spam (this spams continue on the server)

What version of Minecraft are you using?
1.8

What server jar are you using? Spigot

What is this a bug report for? MythicMobs

What version of the plugin are you using? v4.6.5

Describe the bug. Be as specific as possible, images or short gifs/videos are welcome but save configuration files for later sections. Write a whole paragraph if needed, help us bug testers replicate your issue!
I use mythicmobs for a while now, and this randomly occurs by a server restart, this never happened before. and it wont stop anymore. Any fix for this?

https://paste.helpch.at/uqemebeges.shell

Example Configurations

 

You were asked in the discord to post the configs, so you came here and posted the error. I see exactly what the problem is, and maybe with the mob/skill configs I can tell you exactly where the issue is.

 

Likely linked issues:
https://www.mythicmobs.net/index.php?threads/bug-1-8-console-spam.9282/
https://www.mythicmobs.net/index.php?threads/bug-1-8-bug.9279/
Pretty sure this was fixed in dev build 4.8.0 2970 released 02Oct2019.