Database configuration on first startup, even if not wanted

today I have set up Nextcloudpi on my Raspberrypi 4. After the startup, after I have had already access to my Nextcloud, I have rebooted the Pi. Now I get this configuration screen, where I have to setup a database (But I do not need a database). What can I do? I cannot get to the nextcloud itself any more.

Thanks so far!