No need for reply anymore found the bug being mod interference, the bug was from another mod and it made this one act weird.

NuclearCraft Neoteric
Minecraft: 1.20.1
Mod Version: 1.16
Forge: 47.3.12

crash-2025-02-14_19.38.48-server.txt

When I proceed to place a Fission Reactor Casing the game gets a null value and crashes the game. Couldn't spot anything in code why it gets a null value nor during testing see why that would be. As of now it prevents me from making fission reactors in my server and crashes the server too.