App crashes on boot

I can’t open this app. It loads the main memrise logo on the screen but then closes immediately. I am on an iPhone 7 Plus 12.4

Please specify the course where this happens so others may check out whether it happens to them as well.
FWIW, have you already tried uninstalling and reinstalling the app? Just in case something is wrong with your installation as I haven’t ever heard of this problem before.