Steps to reproduce:

(1) Press "Full clone" button. Picture full-clone-1.png appears.
(2) Press "Save". Picture full-clone-2.png appears. Note that, as opposed to full-clone-1.png, the lists of items and triggers are empty.
(3) Correct the name of the host and press "Save" again. Now, "Undefined index" error appears (see undefined-index.png). Also, no items and triggers were copied.

Also, if we would now try to create another host with the name "My Test Access Point 2", and repeat step (2) two times, we would also get the same "Undefined index" there.