Minecraft 1.18.2
mob_grinding_utils-1.18.2-0.4.39
Forge 40.1.31

Server crashed when mob mashers run a few minute.

Error is "java.lang.NullPointerException: Cannot invoke "net.minecraft.world.entity.EntityType.m_20674_()" because "entitytype" is null"

at mob_grinding_utils.ModBlocks.lambda$static$34(ModBlocks.java:184) ~[mob_grinding_utils-1.18.2-0.4.39.jar%23234!/:1.18.2-0.4.39] {re:classloading}

Crash report
crash-2022-06-28_13.56.53-server.txt

Not actually related to the mob masher, its caused by Evilcraft blood stains sending a null somewhere its not supposed to be.
Fixed in 0.4.40