Dean Henderson's mistake piled more misery on winless Crystal Palace as Chris Wood sealed victory for Nottingham Forest in the Premier League.
The Palace goalkeeper, in front of watching interim England manager Lee Carsley, allowed Wood's second-half strike to squirm under his arm.
Oliver Glasner's Eagles remain in the Premier League's bottom three, while Forest rise to eighth after their first home win of the season.
Eberechi Eze and Eddie Nketiah hit the woodwork for Palace, while Ryan Yates also nodded on to a post for the hosts.
Palace enjoyed the better of a bright opening and Eze went close before Nketiah's fine 30-yard effort clipped the upright, but after a slow start Forest roused themselves and Elliott Anderson's excellent run and shot forced Henderson into action.
Wood headed over before being denied by Jefferson Lerma on the line as Forest continued to create chances, and Yates' header came back off the post after 22 minutes.
Forest manager Nuno Espirito Santo - watching from the stands as he starts a three-game touchline ban - would have been encouraged, but Palace regrouped and Matz Sels turned Eze's drive on to the bar after the break.
But Wood struck with 25 minutes left when he seized on Trevoh Chalobah's clearance and his first-time effort from 20 yards crept under Henderson's arm.
Sels then ensured Forest took all three points with another fine save, this time denying Jeffrey Schlupp with 10 minutes left.