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Charlton missed the chance to move four points clear of the Championship relegation zone when they lost 2-1 at home to fellow strugglers Barnsley on Tuesday night.
Marvin Sordell wasted two early chances for the Addicks and Callum Harriott missed a far-post sitter before Jean-Yves Mvoto put the Tykes in front with a powerful header on 32 minutes.
Johnnie Jackson, Diego Poyet and Sordell, again, all missed the target as Charlton looked for a way back.
And their wayward shooting was punished when Tom Kennedy doubled Barnsley's lead on 63 minutes.
Astrit Ajdarevic replied for Charlton from an injury-time corner but Jose Riga's team remain only a point clear of third-bottom Millwall, albeit with a game in hand.
Boss Riga said: "We had control of the game but we have to score before we concede and we conceded a goal from their only opportunity in 45 minutes.
"We have young players so maybe it's the pressure of the situation. But we still have destiny in our hands. They needed to win, we did not."
Charlton play Bolton at home on Good Friday and go to Sheffield Wednesday on Easter Monday.