Index: uc_discounts/uc_discounts.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/uc_discounts_alt/uc_discounts/uc_discounts.module,v
retrieving revision 1.29.2.8
diff -u -r1.29.2.8 uc_discounts.module
--- uc_discounts/uc_discounts.module	26 Nov 2009 17:21:45 -0000	1.29.2.8
+++ uc_discounts/uc_discounts.module	7 Jul 2010 18:25:07 -0000
@@ -1092,7 +1092,7 @@
 
   //Create roles clause
   $auth_rid = ($order->uid != 0) ? DRUPAL_AUTHENTICATED_RID : DRUPAL_ANONYMOUS_RID;
-  $roles_clause = sprintf(" OR d.discount_id IN(SELECT dr.discount_id FROM {uc_discounts_roles} dr" . ", {users_roles} ur WHERE (dr.role_id=ur.rid AND ur.uid=%d) OR dr.role_id=%d OR dr.role_id=%d)",
+  $roles_clause = sprintf(" OR d.discount_id IN(SELECT dr.discount_id FROM {uc_discounts_roles} dr LEFT JOIN {users_roles} ur ON (dr.role_id=ur.rid AND ur.uid=%d) WHERE ur.uid IS NOT NULL OR dr.role_id=%d OR dr.role_id=%d)",
     $order->uid, ALL_ROLES, $auth_rid
   );