In Hunter x Hunter, one of the rules of Nanika/Alluka's power is:
If Alluka is making requests from a particular person, they cannot be moved over to another person mid-way. Therefore if that particular person disappears such as concealing themselves, Alluka is unable to make requests to anybody else.
When Tsubone disappeared from Alluka's sight, Nanika was not able to give her wishes. So therefore, if the target of Nanika's wishes is never seen by Alluka/Nanika again, theoretically, would that be able to stop Nanika from using the wish granting powers?
(This does not include Killua's ability to give Nanika 'orders'.)