Attempt to call method 'removeEventListener' (a nil value)

Hello Rob, 

I managed to solve the issue. Apparently by adding Runtime:removeEventListener( “collision”, onGlobalCollision )’ after physics.pause() in the function onGlobalCollision will fix the issue in my case. This error was occurring because the global collision was not removed when leaving the game to go back to the menu. Thank you once again for the help!