Undefined index: storage at /var/www/html/lib/private/Files/Cache/CacheEntry.php#65

Hi, I hope someone can help.
In my logs I receive the following error message every time I access the web:

Level:Error, App:PHP, Message:Undefined index: storage at /var/www/html/lib/private/Files/Cache/CacheEntry.php#65

I’m using the latest version of NextCloud and all apps, PHP 7.2, Apache, Maria-DB, Ubuntu 18.04
Can someone help me?
That would be nice. Thank you.

Try to add database indices manually:

https://docs.nextcloud.com/server/13/admin_manual/configuration_server/occ_command.html#database-add-indices-label

Check indices of the share table.
Done.

? Only “Done” is output. Is that all right?

You can always add -vvvv to the occ command, then it tells you a bit more. So everything finished and you still get an error?