Call-time pass-by-reference has been deprecated

Warning: Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of drupal_write_record(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file in publicbookings\publicbookings.module on line 444

Solution is to delete & sign:

So replace line 444 from:

      drupal_write_record('publicbookings_clients', &$values, $update);

to:

      drupal_write_record('publicbookings_clients', $values, $update);