Error credentials_helper.php on Amazon Associates Link Builder

I have successfully been using the Amazon Associates Link Builder on many sites since it was released.
But i have this error:

Warning: count(): Parameter must be an array or an object that implements Countable in /web/htdocs/www.clubcountrygrill.com/home/wp-content/plugins/amazon-associates-link-builder/helper/credentials_helper.php on line 150

Are you coming to solve the problem?