If you pop up the developer console (ctrl-shift-J probably) there should be an error report. Send that to me and I should be able to fix the problem. :)
I got the same thing
Uncaught TypeError: Cannot read properties of undefined (reading 'star')
at Object.turn (script.js:2814)
at empireTurn (script.js:3339)
at Array.forEach (<anonymous>)
at turn (script.js:3323)
at script.js:3695
at button (script.js:3095)
at script.js:3695
at Array.forEach (<anonymous>)
at script.js:3691
at Array.forEach (<anonymous>)