Error: Division by zero … on line 268

Can somebody help with this? I love this plugin but since updating, I am getting this on all of my review pages:

Warning: Division by zero in /home/miltonsc/public_html/wp-content/plugins/wp-customer-reviews/wp-customer-reviews-3.php on line 368

Sample page: https://www.miltonscene.com/resources/children/childcare/beth-ryans-playgroup-for-toddlers/

Thanks for any help