Ole Gunnar Solskjaer's future as Cardiff manager is in doubt as the Norwegian held talks with the club's hierarchy in London
Championship live updates
The points were shared at the City Ground after Britt Assombalonga's opener for Nottingham Forest was cancelled out by a Ryan Shotton strike.
Derby centre-back Jake Buxton saw red for a second bookable offence when challenging Chris Burke.
Former Charlton striker David Whyte has died at the age of 43, the club have announced.
Whyte made 106 appearances for the club between 1992 and 1997, scoring 35 goals. He also played for Crystal Palace, Ipswich, Bristol Rovers and Southend.
A statement on Charlton's website read: "Charlton have been extremely saddened to learn of the death of popular former player David Whyte, who passed away on Tuesday. The former Addicks forward was just 43.
"The thoughts of everyone at the club are with David's family and friends at this difficult time."