Hustle PHP 7.2 compatibility issue

Getting the following error when PHP 7.2 is tested with Hustle:

24275#0: *174720 FastCGI sent in stderr: "PHP message: PHP Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/xxx/xxx/wp-content/plugins/hustle/inc/hustle-model.php on line 326
PHP message: PHP Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/xxxx/xxxx/wp-content/plugins/hustle/inc/hustle-model.php on line 326
PHP message: PHP Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/xxx/xxxx/wp-content/plugins/hustle/inc/hustle-model.php on line 326" while reading response header from upstream