jquery autocomplete make If focus on last item, down again, focus not move to first item

I need help how to autocomplete if the focus on last of the list item and me arrow keyboard down, and autocomplete have to not back to the first list item of autocomplete

this my autocomplete on last item

and i down again list focus back to first item

i need help how to make this focus stop on top and bottom

• Topic Participants

• jackhemer123