function check_edit_conflicts($cartname='Items')
{
global $Ajax;
-
- if (isset($_POST['cart_id']) && $_POST['cart_id'] != $_SESSION[$cartname]->cart_id) {
+
+ if (get_post('cart_id') && $_POST['cart_id'] != $_SESSION[$cartname]->cart_id) {
display_error(_('This edit session has been abandoned by opening sales document in another browser tab. You cannot edit more than one sales document at once.'));
$Ajax->activate('_page_body');
display_footer_exit();