Recap of what happened:
Me and my friends created a server to have fun however when we interact with a little tile door the server crashes and crashes again when a player joins after a restart. The only way to get back to the server was to remove the mod.

crash-2021-12-12_17.18.24-server.txt

Sorry, but I don't support Magma. Either use SpongeForge or Forge. Mohist might also work.