PHP Warning and error

Thanks for your quick fix of the warning.

Looks like a very useful plugin. I am having another error though. I am receiving fatal errors related to function is_server() because the number of parameters is zero sometimes. My wordpress site is uses wp 4.9.6 and PHP 7.1.18 on CentOS7.

A piece of the logs:
[Mon Jun 04 15:12:26.448439 2018] [php7:error] [pid 21276] [client 204.12.197.234:58458] PHP Fatal error: Uncaught ArgumentCountError: Too few arguments to function pareto_functions::is_server(), 0 passed in /var/www/mysite/public_html/wordpress/wp-content/plugins/pareto-security/pareto_functions.php on line 142 and at least 1 expected in /var/www/mysite/public_html/wordpress/wp-content/plugins/pareto-security/pareto_functions.php:1568