WooCommerce Division by zero
I have the error message "Warning: Division by zero in /home/larock5/public_html/blahblah.com/wp-content/plugins/woocommerce/includes/wc-template-functions.php on line 250 " showing on my product page. It is on a child theme as disappears when activate the parent. New to this and setting up my first websites, constructing two both with the same child theme, error is only on the one with wordpress version 2.6. First one with w p version 2.5.5 is fine, please can anyone advise how to get rid of this ugly message!