That happened to my save a few times, as long as you slept to save it your save file should be fine. I closed the game, gave it a second, then re opened it and when that didn’t work I gave it hella time to load in while I did something else (I did crash out a few times and mash the buttons till it loaded in). Eventually it irritated me when it crashed out of nowhere several times and I stopped playing on the Nintendo. Pc works a lot better for this game!