PHP 8.1: Uncaught TypeError: mysqli_real_escape_string()

Hey
Thanks for great plugin.

Ubuntu Server 22.04
PHP 8.1 via fpm
MariaDB 10.6.7
Wordpress: 6.0 with custom theme
WP Cerber Security 9.0

Once a while I got problem in logs:

[Mon Jun 13 10:54:45.706995 2022] [proxy_fcgi:error] [pid 24688:tid 139814875690560] [client 20.127.x.x:60062] AH01071: Got error 'PHP message: PHP Fatal error:  Uncaught
 TypeError: mysqli_real_escape_string(): Argument #1 ($mysql) must be of type mysqli, null given in /var/www/MYDOMAIN.YY/wp-content/plugins/wp-cerber/cerber-common.ph
p:2477\nStack trace:\n#0 /var/www/MYDOMAIN.YY/wp-content/plugins/wp-cerber/cerber-common.php(2477): mysqli_real_escape_string()\n#1 /var/www/MYDOMAIN.YY/wp-con
tent/plugins/wp-cerber/cerber-common.php(2935): cerber_real_escape()\n#2 /var/www/MYDOMAIN.YY/wp-content/plugins/wp-cerber/cerber-lab.php(734): cerber_update_set()\n#
3 /var/www/MYDOMAIN.YY/wp-content/plugins/wp-cerber/cerber-lab.php(828): lab_get_key()\n#4 /var/www/MYDOMAIN.YY/wp-content/plugins/wp-cerber/cerber-settings.ph
p(2330): lab_lab()\n#5 /var/www/MYDOMAIN.YY/wp-content/plugins/wp-cerber/cerber-ds.php(877): crb_get_settings()\n#6 /var/www/MYDOMAIN.YY/wp-content/plugins/wp-
cerber/cerber-load.php(137): require_once('...')\n#7 /var/www/MYDOMAIN.YY/wp-content/plugins/wp-cerber/wp-cerb...', referer: bing.com

This is code:

if ( $db = cerber_get_db() ) {
	return mysqli_real_escape_string( $db->dbh, $str );
}