Okay I got it working.
I exited the black screen and loaded the app normally and it started.
Then I restored the latest backup and it all came back.

So should I try the beta?

Usually, this is some issue with a database corruption. In case the app is not coming up, you database will have some corruption.

Please start with tapping this URL on your S20:

http://gps-laptimer.de/laptimer/emergencystartup

LapTimer will backup your current (corrupted) database and reset ...

Hello I am having the same problem.
The yesterday I was at the track and it kept crashing until I accepted the request to perform a backup.
Got in 3 sessions of recording.
But in the afternoon the app kept crashing.
Would not load at all.
And I have the latest version with plenty of free space on my ...