According to your testing, does the issue occur with ONLY Immersive Portals mod installed?

Yes

Forge Version

40.1.86

ImmersivePortals Version

1.4.12-mc1.18.2

Latest Log

https://gist.github.com/UrbanSide/621d74283b0a289eda4bc7929f23919b

Crash Report (if applicable)

No response

Steps to Reproduce

Started connecting to the server
Got this error

What You Expected

I should have connected to the server :D

What Happened Instead

I can't connect to the server due to this error

Additional Details

No response

Please Read and Confirm The Following

• I have confirmed this bug can be replicated without the use of Optifine.
• I have confirmed the details provided in this report are concise as possible and does not contained vague information (ie. Versions are properly recorded, answers to questions are clear).
• I have confirmed this does not happen on the fabric version (If it does please report to here instead).
• I have confirmed I'm not using a hybrid server (Magma, Cauldron) or a different (non official) Forge Server release.

Tracked in #21