I noticed that you can repeatedly click X to spam invites to a user, there should be a timeout on at least 15 seconds to prevent this. When the user retrieves an invite, they can't walk. So it kinda forces them in place.
Just tested this. You can spam multiple invites, but the other user will only receive one. Seems okay.
Many Bothans died to bring us this information.
He will retrieve one, but once he cancels he will receive another one.