Mullins picked up his fifth yellow card of the season during last Saturday's 2-1 defeat at Wycombe and will now serve an automatic one-match ban.
On-loan Chelsea midfielder Liam Bridcutt limped out of the action towards the end of the game at Adams Park after picking up a knock.
However, he will be fit to face the Addicks after returning to training to give County a boost as they bid to end a dismal run of seven successive league defeats.
Ablett has no new injury worries but striker Oli Johnson (knee) and midfielder Matty Mainwaring (broken leg) remain sidelined.
Stockport are confident the match will go ahead following the recent spate of postponements at Edgeley Park because of a waterlogged pitch.