database query error in credit module debug

currently line 162:
$result = db_query("SELECT order_id FROM {uc_orders} WHERE uo.modified <= %d AND uo.order_status = '%s'", $time, variable_get('uc_credit_clear_status', uc_order_state_default('completed')));

note that name 'uo' is not defined. This throws sql errors when credit cards are processed. This code only runs when credit card processing is in "debug mode" and being stored.