How do you delete an invitation if the invite is unavailable?

It appears the person I invited closed their account. There is no box to the left of the "invite is unavailable" to remove it. Help!
How do you delete an invitation if the invite is unavailable?
You go to the mail box page click on the outstanding invitations and delete it there. But if you are talking about it from there then Wait until you get some more messages to delete and a box may show up then, It did for me. And send out another invite and l am sure you can delete after you have been excepted. And this worked for me