domain_get_domain calls sometimes are not populated with machine_name

This is in the context of a rule condition. I have a rule condition component, and one is a custom condition that compares the domain machine name. Here is the code for it, modified from the domain_rules module:

  $current_domain = domain_get_domain();
  $current_domain = $current_domain['machine_name'];
  $subdomain = trim($subdomain);


  switch ($operator) {
    case '!=':
      return ($subdomain != $current_domain);
    case '~':
      return fnmatch($subdomain, $current_domain);
    case 'regexp':
      return (preg_match('#' . $subdomain . '#Ui', $current_domain));
    case '=': default:
      return ($subdomain == $current_domain);
  }

The domain_get_domain() call only returns an array with the following indexes:

- domain_id
- subdomain
- active_alias_id
- redirect
- site_grant

That is not the full array I get in other contexts, which includes the indexes machine_name, is_default, path, scheme, sitename, and the alias array.

The rule condition itself works fine in other areas. So I go to the shopping cart, and condition checks fine and returns correctly. But as soon as I go to the first checkout page, which calls the same rule from the same event (Calculate the price of a product), the condition gets a truncated domain array.

I also pulled straight from the globals variable to check, and it was the same. Which makes sense, since that is all the function itself does anyway.

I haven't done anything with the hook_domain_load for this site, either.

Thanks.

In the meantime, I was able to hack around it with this code after getting the domain:

  if(empty($current_domain['machine_name'])) {
    $current_domain['machine_name'] = domain_load_machine_name($current_domain['domain_id']);
  }

So I had to manually call the domain_load_machine_name function.