Hi Folks,
When customers log into my Zencart, they get the error:

"Warning: Division by zero in /<directory>/shop/includes/classes/shopping_cart.php on line 876

Warning: Cannot modify header information - headers already sent by (output started at /<directory>/shop/includes/classes/shopping_cart.php:876) in /<directory>/shop/includes/functions/functions_general.php on line 52"

For me the next page appears fine, but others are complaining about not being able to get past this page.

Please help! Any ideas?

Cheers,
Steve.