What Feature Types Apply to This Bug?

Block

Other Type

No response

What Type of Bug Is This?

Crash

Mod Loader

Forge

Mod Loader Version

43.5.0

The Aether Version

1.5.1

Is This Bug a Conflict With Another Mod?

probably, can't really tell

Client Log

https://gist.github.com/lllMohandarlll/0b0d0e026cbb6ca7e62bc04119b6fe49

Crash Report (if applicable)

https://gist.github.com/lllMohandarlll/cac21b223b095e80841cf982ab09df2a

Steps to Reproduce

when attempting to join world

What You Expect To Happen

not to crash ?

What Actually Happened

crash

Additional Details

Please Read and Confirm The Following

• I have confirmed this bug can be replicated without the use of Optifine.
• I have confirmed this bug is on the most recently supported version of Minecraft.
• I have confirmed the details provided in this report are concise as possible and does not contain vague information (ie. Versions are properly recorded, answers to questions are clear).
• I have confirmed this bug is unique and has not been reported already.
• If playing on a modpack, I have reported this bug to their issue tracker already.
• I have confirmed that I'm reporting a bug in The Aether I, not The Aether II.

this is an aether redux issue (Zepalesque/The-Aether-Redux#143)
which i will fix at some point