Version Info

• Minecraft, 1.12.2
• Wormhole, 1.1.11

Steps to Reproduce

• install the mod and its dependencies on a forge server
• attempt to start the server

Crash report (~/logs/latest.log)
Log: https://mclo.gs/GMS3ACq
Crash Report: https://mclo.gs/iExuGw4

This issue doesn't exist in v1.1.10

Fixed now in version 1.1.11a for Minecraft 1.12.

Thank you for reporting the issue!