With the protests of their fans ringing in their ears, Arsenal 's mood was worsened as Bernd Leno's dismal blunder gifted Everton a 1-0 victory at the Emirates.
The Gunners goalkeeper let Richarlison's cross through his legs, diverting it into the back of the net to hand the Toffees the winner in the 76th minute.
Although Arsenal had the lion's share of possession and shots, Everton were the more threatening of the sides throughout the match.
Richarlison had the best chance of the first half and forced an excellent save from Leno with a powerful bottom corner-bound shot.
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