Arsenal saw their recent Premier League resurgence checked as they were held to a goalless draw by Crystal Palace.
Having won their last three league outings to end a barren spell, the Gunners were unable to find a way past their visitors - who came closest to winning the game through a James Tomkins header which hit the crossbar.
The 0-0 draw means Palace remain unbeaten in their previous five meetings with Arsenal and they stay just a point behind Mikel Arteta's men.
Arsenal made two changes to the side that won 4-0 at West Brom in their last league outing - both enforced as Kieran Tierney and Pablo Mari were left out as precautions.
The hosts were largely frustrated by a Palace side playing on the counter-attack and on the few occasions they did get in behind, they largely wasted the opportunity.
Pierre-Emerick Aubameyang shot straight at Vicente Guaita in one moment of promise, while Hector Bellerin managed to take the ball off the foot of team-mate Alexandre Lacazette when the in-form France forward looked poised to strike.
It would be Palace who came closest to breaking the deadlock before the interval - firstly as Eberechi Eze's deep free-kick was headed against the frame of the goal by Tomkins.
Then Bernd Leno was called into action, making a fine diving stop to keep out Christian Benteke's effort moments later.
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