Causing spam like appear both on clientside and serverside.

This doesn't crash game, however, this causes major FPS lag (only if console is open) and entities which are incompatible with Infernal Mobs are not appearing on client.

Example - Mekanism's Flamethrower flame (great for reproduction and debugging).

Uhhh Infernal Mobs should only trigger for EntityLiving(Base?), why would a flamethrower flame use that?

If this happens for whatever reason, i suppose it is the users responsibility to set the Entity as blacklisted in Infernal Mobs config

https://github.com/aidancbrady/Mekanism/blob/master/src/main/java/mekanism/common/entity/EntityFlame.java#L33 🤔

Are you sure that problem is even related to infernal mobs? https://github.com/AtomicStryker/atomicstrykers-minecraft-mods/blob/1.12.2/InfernalMobs/src/main/java/atomicstryker/infernalmobs/common/EntityEventHandler.java#L58
I mean, looking at that stack nothing jumps at me

Will investigate futher