Charlton Athletic are leading Bristol City 1-0 at half-time through a Danny Haynes strike.
Derek McInnes's side started brightly and almost forced an opening when Martyn Woolford found space to shoot in the tenth minute, but Leon Cort produced a vital block.
Salim Kerkar had an opportunity for Charlton at the other end, forcing a good save from Robbins keeper Tom Heaton.
The Addicks edged their noses in front on the 20-minute mark, and it was former Robbins star Haynes who gave them the lead, finding the bottom corner from Dale Stephens's pass.
Bristol City almost hit back seven minutes later when Woolford found Sam Baldock in space, but he failed to trouble Ben Hamer between the Charlton sticks.
They enjoyed plenty of attacking possession in the closing stages of the first half, but couldn't break down a resilient Charlton defence.
