Card Session Error and Fix.

diff --git a/sales/includes/sales_ui.inc b/sales/includes/sales_ui.inc
index 5873c3eb755f8b2dba6621d58f4a17381944ebf0..9b7626218bbba6ac8d8c94ecfaa1732ab8679b5a 100644 (file)
--- a/sales/includes/sales_ui.inc
+++ b/sales/includes/sales_ui.inc
@@ -46,7 +46,7 @@ function check_edit_conflicts($cart_id, $cartname='Items')
 {
        global $Ajax, $SysPrefs;
 
-       if ((!isset($SysPrefs->no_check_edit_conflicts) || $SysPrefs->no_check_edit_conflicts==0) && $cart_id && $cart_id != $_SESSION[$cartname]->cart_id) {
+       if ((!isset($SysPrefs->no_check_edit_conflicts) || $SysPrefs->no_check_edit_conflicts==0) && $cart_id && isset($_SESSION[$cartname]) && $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();