Thank you for bringing this to my attention, I appreciate it greatly.
The problem is essentially the game trying to load config save data that hasn't been created yet, it's set up to catch any old versions of the game so that they can be updated/overwritten, but if you dont have any config save data, it runs into issues.
The good news is that this was brought to my attention previously and i've since sorted out the problem.
the bad news is that because I'm halfway through my next updated version, I wont be able to hotfix it until the next update, which should hopefully be available next month.
The good news again is that I'm fairly certain that this is an issue for the downloadable version of the game only, so the browser version should still work fine.