Shkodran Mustafi was singled out for his awful defensive performance against Crystal Palace.
Palace striker Christian Benteke opened the scoring in the 17th minute after heading home from a free-kick with Arsenal's German defender failing to track his man.
He was then at fault for Palace's second goal. A horrible mix-up with Bernd Leno allowed Wilfried Zaha to net from close range.
The visitors then bagged a third with Arsenal fans venting their anger at Mustafi.
Pierre-Emerick Aubameyang pulled one back though Arsenal eventually lost 3-2 to Palace.
The Gunners miss the chance to leapfrog Tottenham as they remain in fourth place with four league games left of the season.
Will Unai Emery's team secure a Champions League spot? Let us know what you think.