mscs: [: =: unexpected operator when running a world imported from previous install

I keep the config of the minecraft servers i run with mscs on a git repository, when installing mscs on a new machine and set up the configs, i get the following error when i try to run any of the servers i backed up, but if i create a new world the error doesn’t happen

/usr/local/bin/msctl: 361: [: =: unexpected operator
/usr/local/bin/msctl: 365: [: =: unexpected operator
/usr/local/bin/msctl: 369: return: Illegal number: -1