Deleting Ghost town from fort ownership



so i was doing a bit of checking of my towns forts and forgot that a town who gotten banned who were members of one of my forts.. i try to remove them and all i get is this..

when i try to remove the ghost town it gives "this player has already been invited" pretty much is a bug since its a ghost town who somehow not cleared from fort ownership :)

nor can i clear them by the looks of it haha..anyone else see this before?