Barnsley conceded two goals from set pieces and Craig Davies missed a penalty as the Reds lost 2-1 at home to Birmingham City on Boxing Day.
Curtis Davies netted both goals for the visitors, who Barnsley had beaten 5-0 at St Andrew's earlier this season.
Jonathan Greening pulled one back for the Reds as he smashed home from 20 yards after neat work by Scott Golbourne.
Barnsley should have won it in the second half when the referee pointed to the spot after Steven Caldwell handled in the area but Craig Davies' penalty flew high and wide into the Pontefract Road End.
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The Reds have now won just once in their last 13 games and haven't won at home since September 1.
