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Charlton drew their second successive League 1 game at The Valley, when they were held 1-1 by Sheffield Wednesday on Monday night.
Bradley Wright-Phillips gave the Addicks the best of starts when he cut in from the left to fire a shot past Richard O'Donnell after just three minutes.
Dale Stephens had an excellent opportunity to make it 2-0 but lifted his effort over the bar from inside the box in the 16th minute.
Former Crystal Palace forward Clinton Morrison made an immediate impact for the Owls when he came on for in the injured Ryan Lowe who had himself replaced Chris Sedgwick in the first half.
Within three minutes of his arrival he headed in an equaliser from close range following a corner from Chris Lines.
Charlton's best chance of getting a second goal fell to Matthew Taylor, but his effort flew just wide of the far post on the hour.