Game crashes during purge event

Fatal error:
[File:C:\B\tech_exiles\code\UE4\Plugins\Dreamworld\Source\Dreamworld\Public\DeferredQueue.h][Line: 185]
FExternalDeferredActionQueue:Trying to enqueue to a full queue

Yup, it crashes the server every time if you get too many creatures around during the purge.

Unsatifactory Answers:

Use fewer thralls to defend.
Kill the bad guys faster.
Play a lesser difficulty.

Things that don’t help:

Getting a bigger server (mine runs at about 15% during the crash)
Getting a bigger network pipe
Getting a bigger client PC
Having fewer players around