I've been using your mod a while and really love it but the only crash i ever have involves the grinder. the log keeps mentioning a head drop event or something.

java.lang.NullPointerException
at mob_grinding_utils.events.EntityHeadDropEvent.dropEvent(EntityHeadDropEvent.java:41) ~[EntityHeadDropEvent.class:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_800_EntityHeadDropEvent_dropEvent_LivingDropsEvent.invoke(.dynamic) ~[?:?]
this is some of the log. sorry if this is wrong.

really sorry i didnt see the closed issue referring to infernals sticky mob. ill have a look and see what i can do. thanks