I got a hardlock on Android. I believe it's not the first time. When I try to start the game, it gives me a black screen that stays forever.
The game tried to give the error message, but then crushed. What I could make out was “fatal error, returning empty space on...”
Probably a save got corrupted, as when I cleared the game files from settings, all returned to normal. But I didn't edit my saves previously. It happened out of blue basically, after just having an encounter on the map.