Lazy initialization and deinit

I would to know if it's possible, in my view controller, use a lazy property and in deinit method call a method of my lazy property only if it was initialized. Below some code:

fileprivate lazy var session: MySession = {
    let session: MySession = MySession()
    session.delegate = self
    return session
}()

deinit {
    session.delete()
}

In this way, when session.delete() in the deinit method is called and session hasn't been used (so is still nil), it's initialized and then delete is called. I don't want this. I'd like to call delete only if session had been previously initialized.

Is there a way to achieve this? Have I to let go the lazy initialization idea?