nextcloud 12 upgrade error

[nemesi2017]

I tried to upgrade by web interface nextcloud from 11.0.1 to 12. At a certain point, an error appeared:

Doctrine\DBAL\Exception\SyntaxErrorException: An exception occurred while executing 'DELETE FROM oc_reader_bookmarks b WHERE b.file_id = ?' with params [36]: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'b WHERE b.file_id = '36'' at line 1

And this is the log:
Preparazione dell'aggiornamento
Imposta il livello del log per il debug
Modalità di manutenzione attivata
Aggiornamento schema database
Database aggiornato
Doctrine\DBAL\Exception\SyntaxErrorException: An exception occurred while executing 'DELETE FROM oc_reader_bookmarks b WHERE b.file_id = ?' with params [36]: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'b WHERE b.file_id = '36'' at line 1

Someone had the same problems or know a solution? Now my nextcloud is not working at all.

Thank you for your help :)

[MorrisJobke]

Duplicate of #5293