[X] I have confirmed this bug can be replicated without the use of Optifine.
[X] 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).
[X] I have confirmed this does not happen on the fabric version (If it does please report to here instead).
[X] I have confirmed I'm not using a hybrid server (Magma, Cauldron) or a different (non official) Forge Server release.
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