Error when killing mythic mobs when having taken a quest to kill other mythics. Also error on plugin load.

[Momshroom]

What is your Quests version / build number (do not say "latest")?
4.0.6-b254

Describe the problem and how to replicate it. Any console errors to post using a pastebin?
When a player has an active quest to kill one type of mythic mobs, I get this error when they kill any mythic mobs (whether or not that mythic is a quest objective). Players without the quest do not cause the error. The error did not occur in Minecraft 1.16.5, but does in 1.17.1 (paper 190):
https://paste.gg/p/Momshroom/b0b20046c6f341d2ace35f4c25ea2046

I also get this error on loading the plugin:
https://paste.gg/p/Momshroom/55960053142d43a68bd25eaf9ea7db0f

I realize it might well be an issue with the Mythic Mobs Objective module and am sorry for bothering you if that's the case.

If applicable, can you provide an example quest from quests.yml using a pastebin?
https://paste.gg/p/Momshroom/8f41f5e58c3349fda461906c792ccf0c

[PikaMug]

This is an issue with the MythicMobs module, seek help from its developer.

[Momshroom]

Thank you.
For anyone else who might be following this in the future, here's my ticket with MythicMobsQuests: BerndiVader/MythicMobsQuestsModule#49