https://gist.github.com/Hootling/b72df53a486a38fe832e4e4f35a268f0

I get this crash on startup on multiplayer server. No issues running it in singleplayer for same pack.

If I disable just EnderZoo, the rest of the pack loads fine.

This was closed via 52ba721 but I don't know if a build was ever published.

I'm going to assume no, since I'm still getting the crash?

This build should fix said issue, until there is an actual release:
https://www.dropbox.com/s/fcllq0uiyx8pkzj/EnderZoo-1.12.1-1.4.0.49.jar?dl=0
You'll only need it on the server.