Arsenal manager Mikel Arteta praised David Raya for his reaction after the goalkeeper's error in their north London derby win over Tottenham.
The Gunners were leading 3-0 when Raya tried a dinked pass into midfield but found Tottenham's Cristian Romero, who placed the ball past the Spaniard.
Son Heung-min then scored a penalty but Arsenal held on to remain top of the Premier League, albeit by just one point after Manchester City's win at Nottingham Forest later on Sunday.
"It became a game of chaos but we are lucky to have the keeper we have," Arteta told Sky Sports.