Minecraft Version

1.21.1

Mod Version

1.21.1-1.2.0

Crash Report

https://pastebin.com/sY6Uncf5

Log

https://pastebin.com/eCWg1Q5D

Additions and Modifications

Yes

Additions and Modifications Description

Mod List: https://pastebin.com/BWHHSjPs
No configs modified
Note: Crash occurs with stellaris-1.21-neoforge-1.1.6. Crash does not occur with stellaris-1.21-neoforge-1.1.5. Making a report on the stellaris github page as well. st0x0ef/stellaris#41
Crash occurred when clicking trying to create a new world.

Did the crash happen in singleplayer or on a server?

Singleplayer

Stellaris issue, I answered on the other issue. Thanks for reporting. We need to wait for an update on their end.