Referee Keith Stroud has admitted he blundered by not allowing Newcastle to try again with a penalty that was disallowed for encroachment in the Magpies' 1-0 win over Burton.
Matt Ritchie had a penalty ruled out after half an hour in controversial circumstances that briefly threatened to derail the Magpies' push for the title.
Stroud awarded Burton an indirect free-kick rather than ask for the spot-kick to be retaken after Dwight Gayle dashed into the penalty area before it was taken.
Rules of the game indicated Newcastle should have been allowed a second chance from 12 yards, and referees' body Professional Game Match Officials Limited (PGMOL) confirmed Stroud had made an error.