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Charlton's run without a win increased to six games after they were held to a draw by Derby in the Championship at The Valley on Saturday.
The home side broke the deadlock when a fine run and shot from Danny Haynes put them in front after 19 minutes.
They could have doubled their advantage but Michael Morrison (pictured) was unable to make the most of Yann Kermorgant’s cross while, at the other end, Addicks keeper Ben Hamer denied Ben Davies and Nathan Tyson.
Charlton looked capable of extending their lead after the break with Bradley Pritchard going closest with an effort that hit the bar.
But the home side paid for the price for not getting a second when Morrison brought down Richard Keogh in the penalty area.
The Charlton player was dismissed, after being shown a second yellow card, and Derby substitute Jamie Ward, who had only been on the pitch for two minutes, equalised from the spot.
It almost got worse for Charlton when John Brayford's header came back off the post.