[Bug Report] Server crash on instance close, issue with MM block masks?

A player left a dungeon as they lost all lives, then the server crashed. That is all the info I have.

Here is the crash log: https://mclo.gs/LYnhFfR

I see some MythicMobs block masks in the trace, so maybe it is related to it.

MythicDungeons build 142, Mythicmobs 5.2.5, Purpur 1.19.3.