Liverpool fans have taken to Twitter to point out the irony of Simon Mignolet's blunder.
The 29-year-old flapped Granit Xhaka's long range shot into the back of the net for Arsenal's equaliser.
Liverpool were leading the game after Philippe Coutinho and Mohamed Salah put the visitors ahead.
But Alexis Sanchez pulled one back for the Gunners one minute later with a terrific diving header.
Three minutes later, and Xhaka let rip from distance with a venomous left-footed volley. Despite the ball heading straight at Mignolet, the Belgian shot-stopper could only flap at the ball and watch it fly into the back of the net.
Naturally, Liverpool fans took to social media to slam the Reds number one.
But some supporters spotted the irony in Mignolet's blunder...