Error on Order Total

Hello,

Can someone please help me figure out how to fix this error? I'm receiving this erros:
Warning: Division by zero in /home/annettes/public_html/includes/modules/order_total/ot_group_pricing.php on line 79

On this webpage:
https://myinetserver.com/~annettes/index.php?main_page=login&zenid=ece84933e82c68a8d1bbceba1e282fb0

Your help is appreciated!
Thanks,
Annette
https://www.annetteslingerie.com

Here is what I found in code regarding the division by zero. I'm not sure what to change it to. Can anyone help?

'customer_id'] . "'");

if ($group_query->fields['customers_group_pricing'] != '0') {

  $group_discount = $db->Execute("select group_name, group_percentage from " . TABLE_GROUP_PRICING . "

                                  where group_id = '" . (int)$group_query->fields['customers_group_pricing'] . "'");

  $gift_vouchers = $_SESSION['cart']->gv_only();

  $discount = ($order_total - $gift_vouchers) * $group_discount->fields['group_percentage'] / 100;

  $od_amount['total'] = round($discount, 2);

  $ratio = $od_amount['total']/$order_total;

  /**

   * when calculating the ratio add some insignificant values to stop divide by zero errors

   */

Take a look at this thread. > http://www.zen-cart.com/forum/showthread.php?p=487731

Thank you!

Your welcome but did this thread resolve your issue?

Hello,
I finally had time to make this change. The above instructions did resolve that issue. The problem now is I'm receiving these parse errors when I make changes. When I open the .php files, make the change, and upload, the formatting messes up and the .php essentially becomes a continuous word wrap document with no hard returns. ? I'm receiving this error now:

Parse error: syntax error, unexpected T_CLASS in /home/annettes/public_html/includes/modules/order_total/ot_group_pricing.php on line 8

1. how do I correct this error? and 2) how do I correct the formatting problem when uploading the new .php?

With this latest error, we are unable to checkout orders. Help needed asap! Thanks!