Exception MariaDB Error while deleting User xxx

[code]# sudo -u http php occ user:delete test

[Doctrine\DBAL\Exception\SyntaxErrorException]
An exception occurred while executing ‘DELETE FROM oc_reader_bookmarks b WHERE b.user_id = ?’ w
ith params [“test”]:
SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; che
ck the manual that corresponds to your MariaDB server version for the right syntax to use near ‘b
WHERE b.user_id = ‘test’’ at line 1

[Doctrine\DBAL\Driver\PDOException]
SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; che
ck the manual that corresponds to your MariaDB server version for the right syntax to use near ‘b
WHERE b.user_id = ‘test’’ at line 1

[PDOException]
SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; che
ck the manual that corresponds to your MariaDB server version for the right syntax to use near ‘b
WHERE b.user_id = ‘test’’ at line 1

user:delete

[/code]

Can you explain what is the actual problem?
Two days ago I did a update from OC-9.1.3.1 to NC-11.0.2 where I only copied conf/ and edit conf.php for the right path…

Can I delete the oc_reader_bookmarks table ?

Okay I’ve deactivated the “Reader (ebook reader) v.1.0.3” than I was able to delete the user…