[Defender Pro] PHP Warning from the Defender plugin

Hey guys,

I have marked this as a Defender issue but really I just want some enlightenment as to what the following error could be as it keeps on recurring;

PHP Warning: count(): Parameter must be an array or an object that implements Countable in /home/mysite/public_html/wp-content/plugins/wp-defender/app/module/ip-lockout/controller/main.php on line 643