metal-stars-updates.lua
change "if data.raw.planet.nix then return end" to "if not mods["metal-and-stars"] then return end"

Yeah, that's literally what the check was before; but checking for the planet shouldn't cause an error on load. The data.raw.planet table is guaranteed to exist, so if the "nix" key does not exist, then it will simply fail the check and return end

This was changed so that the logic runs with the new Metal and Stars fork, as well as any other future forks

EDIT: I realize my mistake now, I accidentally flipped the check, should be fixed in v1.0.47