use array instead of stdClass

booking.helper.inc

@@ -1320,7 +1320,7 @@ function _booking_paypal_form_builder($node, &$form_state, $person, $invoiceid,
  * This will be used to select which fields to import/export to/from a CSV
  */
 function _booking_get_person_fields() {
-	$list_of_columns = new stdClass();
+	$list_of_columns = array();
 	$query = db_query('SHOW COLUMNS FROM {booking_person}');
 	$result = $query->fetchAll();