I also get this bug when using an American database and a North American continental competition. I believe it is a bug due to the rule discipline error. I have a save you can use to test this. It is uploaded to the cloud and called
Spectator Poo - Helenites.fm
If you go to the rules tab for the competition Central and Caribbean Cup it will crash.
I also noticed that if I create a save with only one of the files, when I go to the detail level option North America shows up in continental club competitions. When I use both files, North America does not appear.
test.fmf zz My America.fmf