Prodslistquantity jobs

My son's website is a storefront that uses a premium wordpress theme I have purchased. Both my host and the theme creator say the problem is not theirs. I am receiving the error message below when anyone tries to checkout or view their shopping cart on my site. Warning:...wordpress theme I have purchased. Both my host and the theme creator say the problem is not theirs. I am receiving the error message below when anyone tries to checkout or view their shopping cart on my site. Warning: Division by zero in /home/saucyspi/public_html/wp-content/themes/mk4/pg/paypal/ on line 154 That line of code says: $prodslistamount = $prodslistamount/$prodslistquantity; Not really sure why it's trying to divide here. Need some help squaring this away so his customers c...