When this Extension is in use in WordPress Multisite, the "CiviDiscount" is improperly added to the CiviCRM Navigation Menu when the `domain_id` is not the primary one. The reason is that `CRM_Core_DAO::getFieldValue()` does not default to the current `domain_id` and returns the first item that it finds - which is the menu item for the primary `domain_id`. This causes the "CiviDiscount" menu item to be improperly added. The `$params` passed to `cividiscount_civicrm_navigationMenu()` do however contain the correct menu data, so searching the array produces the correct ID for the "Administer" menu. FWIW, it seems that this is a common way of finding the Administer menu item - [CiviRules does it the same way](https://lab.civicrm.org/extensions/civirules/merge_requests/9) and suffers from the same problem.