[Done v1.6.0] Constant OFFICE_IP_TO_HOST_ADDRESS already defined

[lat9]

I'm getting the subject PHP warning on my checkout_confirmation page; traced it down to /includes/languages/english/email_extras.php. Line #25 reads:

  if (!defined('OFFICE_IP_TO_HOST_ADDRESS')) define('OFFICE_IP_TO_HOST_ADDRESS', 'OFF');

and then Line #51 reads:

  define('OFFICE_IP_TO_HOST_ADDRESS', 'Disabled');

The warning's being issued on line#51; I don't know whether 'OFF' or 'Disabled' is the correct value.