MC 1.19.2
FAPI 0.62.0
The Graveyard 1.10
Precise Damage 1.0

To reproduce just spawn any mob from The Graveyard and try to hit it.

Logs: https://gist.github.com/Footage2-Amply-Pounce/a0a2e54411f12488f18eafbf3cf55c01

I believe this is due to my botched optimization of the mob attribute lookup. It worked with Vanilla mobs (which is what I tested with), but some modded entities cause errors. Can you see if this jar fixes the problem?
(unzip the Action's file, and grab the jar without -sources or -dev)

Deleted my last reply. I forgot to actually throw the new version in before testing 💀 With the 1.1 version everything works. Should I close the issue?

I'll keep it open until I publish the new version on CurseForge, Modrinth, and GitHub.

I've been really busy lately and have not had the time to set up an auto-publish script yet