Mikel Arteta inexplicably claimed David Raya was not at fault for two second-half Luton goals which gave Arsenal an almighty scare until Declan Rice's last-gasp winner.
With the Gunners 2-1 up, Raya flapped at Alfie Doughty's corner, allowing Elijah Adebayo to score.
And then eight minutes later, Ross Barkley had his strike go straight through the goalkeeper to put Luton 3-2 ahead.
But Arteta refused to condemn his No1 goalkeeper for the two errors.
He said: 'We have to defend better the situations as a team. There are certain things leading to the goals.