We got a warning while using your defender plugin. In wp-defender/app/module/ip-lockout/controller/main.php file at 544 line before using count($args) you should check if $args is an array.
This is the warning:
PHP Warning: count(): Parameter must be an array or an object that implements Countable in /wp-content/plugins/wp-defender/app/module/ip-lockout/controller/main.php on line 544
Could you correct this error? It pollutes our log.