Peterborough manager Darren Ferguson is backing goalkeeper Joe Lewis to get over the mistake he made in Saturday's defeat at Leeds United.
Lewis parried away a shot which allowed Leeds striker Jermaine Beckford to pounce for the first goal of the game after the hour mark.
Beckford's first goal proved to be the turning point, as the home side got a stronger grip on the game and pulled away for an eventual 3-1 victory.
"The lapse of concentration from Joe has cost us, he's there to do a job and he's made a mistake," Ferguson told BBC Radio Cambridgeshire.
"But Joe saved us many a time, I don't want to be too critical."
Lewis has been blamed for other soft goals throughout the season, but has also kept nine clean sheets.
On the result, Ferguson added: "It was different from the 4-0 defeat at Leicester where we deserved to lose and we didn't do ourselves justice.
"Even some of the Leeds fans were applauding at the end and if we keep performing like that we'll get results."