Jordan White struck the winner in extra-time as holders Livingston advanced in the Petrofac Training Cup with a 1-0 second-round victory at Queen of the South.After both sides squandered chances to take the lead, White headed home from close range with just five minutes of the additional 30 minutes remaining.Dale Hilson, Paul Heffernan and Mark Millar, twice, wasted early opportunities for the home side while for Livi Jackson Longridge fired wide and Craig Sives had a header saved by Robbie Thomson.Doonhamers substitute Derek Lyle was denied by Darren Jamieson and Millar headed wide and they were made to pay when White bundled home.It was quick revenge for Livi following their 1-0 home loss in the Scottish Championship on Saturday.