Had an antique atlas in the hotbar with overlay enabled and entered a compact machine, the game crashed. I'm giving a wild guess that since compact machine dimensions basically have nothing to render on a map anyways there is nothing for the map to record into memory.

I suggest (allow) blacklisting the compact machines dimension from being recorded by Antique Atlas as it is useless in that dimension anyways.

Versions:
Antique Atlas: 4.4.7
Forge: 14.23.3.2655
Minecraft: 1.12.2

Crashlog: https://paste.ee/p/JpzFI

Okay, this should be fixed in 1.12.9

No further comment. I must assume it's fixed.