Chelsea's Eduoard Mendy gifted Leeds an opening goal as Brenden Aaronson took advantage of his howler to kick-start a superb afternoon for the hosts at Elland Road.
The Senegalese shot-stopper dawdled on the ball in the 33rd minute and was closed down by Aaronson, who pinched it off his toes before passing into an empty net.
Fans quickly pounced on the goalkeeping error on social media, with many highlighting that this is not the first time Mendy's distribution has been questioned.
One fan wrote: 'That's been coming from Mendy.