Nigel Pearson bemoaned one lapse of concentration that cost his side three points but set his Bristol City side the target of being more ruthless in front of goal going forward.
The hosts dominated possession for large periods, creating openings from wide areas but were often left frustrated with their final ball. Nahki Wells thought he scored the opener but was adjudged offside when he turned in Andi Weimann's initial strike from close range.
As the first half was drawing to an end, a superb piece of play down the right proved the catalyst for Tommy Conway to grab his 10th goal of the season. Weimann fed the forward to laid it first time into the path of George Tanner.