Fatal error in php log

Hi,

I’m getting this message in php log:

Fatal error: Uncaught TypeError: preg_match(): Argument #2 ($subject) must be of type string, array given in /var/www/htdocs/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/SpbctWP/Helper.php:160

Stacktrace
1.	preg_match()/var/www/htdocs/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/SpbctWP/Helper.php:160
2.	CleantalkSP\SpbctWP\Helper::http__request__rc_to_host__test()/var/www/htdocs/wp-content/plugins/security-malware-firewall/inc/fw-update.php:71
3.	spbc_security_firewall_update__init()[internal function]:0
4.	call_user_func_array()/var/www/htdocs/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/Common/Cron.php:122
5.	CleantalkSP\Common\Cron->runTasks()/var/www/htdocs/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/Common/Cron.php:53
6.	CleantalkSP\Common\Cron->execute()/var/www/htdocs/wp-content/plugins/security-malware-firewall/security-malware-firewall.php:274
7.	include_once('...')/var/www/htdocs/wp-settings.php:418
8.	require_once('...')/var/www/wp-config.php:116
9.	require_once('...')/var/www/htdocs/wp-load.php:55
10.	require_once('...')/var/www/htdocs/wp-admin/admin-ajax.php:22
11.	{main}
thrown in /var/www/htdocs/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/SpbctWP/Helper.php on line 160