A different error

I now get a different error at the top of posts which includes the fundraising form and the page created in the Fundraising section:

Warning: Division by zero in /var/www/vhosts/k4k.moonworkspublishing.com/httpdocs/wp-content/plugins/fundraising/lib/template-functions.php on line 56

You can see the error here:
http://k4k.moonworkspublishing.com