After upgrade the app page remains white

After the upgrade to version 16.0.2 and some problems with the upgrade, I get a white page when I try to access the app page, all other pages and Nextcloud also work perfectly. The upgrade stopped and I had to start the upgrade via command line after uploading the new files via FTP.
Does anyone have a hint in which direction I should go, funny is that only the app page is affected?

Betriebssystem Ubuntu 18.04 (64-Bit)
Kernel 4.15.0-54-generic
Webserver Apache/2.4.29 (Ubuntu)
PHP 7.2.19-0ubuntu0.18.04.1
Datenbank-Version 5.5.5-10.1.40-MariaDB-0ubuntu0.18.04.1

Clear the Webb browser cache.

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