Thanks to the posters on ResetEra, we are now able to replicate the bug that causes the game to crash onto a black screen after the opening logos.

This is on the Nintendo Switch version of the game, but might also apply to the PS4 version.

BUG trigger

• Delete Summon Stones (doesn't seem to matter how many of them you delete)
• Exit to main menu and watch the game save ("Game Saved" shows up on screen)
• Close the game immediately afterward

After that point, the save seems to get corrupted and will result in the black screen error. The issue seems to be related to the summon stones.

However, if you play a music stage and then let the game save after that, the bug will NOT occur.

This may or may not be related to the PS4 bug that crashes the game on the Music Stages screen, so I would still recommend backing up your clean saves to the cloud/USB if possible until this is patched.

In summary, either don't delete any summon stones (the cap is 999) OR play a stage and let the game save before exiting out of the game.

Don't let deleting summon stones be your last action before quitting the game.

Or you could just never close out of the game, but be careful of random crashes and not backing up your save.

Hopefully this will help save your progress and avoid this critical bug until the game gets patched.

EDIT: As several comments have pointed out, this is unfortunately not the only trigger (and it may not happen without certain other unknown variables), but it seems that playing a song and letting the game save that progress right before closing the game hopefully prevents the save corruption from happening.

If you plan on closing the app, I'd definitely recommend finishing a song and saving as the last action you do before closing out. And back up your safe saves!!