Arsenal fans were left livid following a major error by VAR Lee Mason in their game against Brentford.
The Gunners were leading 1-0 through a goal from Leandro Trossard, but Ivan Toney equalised for Brentford in the 74th minute.
Christian Norgaard was offside when he crossed the ball for Toney, but, remarkably, Mason forgot to draw offside lines during the VAR check for the goal.
The goal ended up standing and it could have significant repercussions in the Premier League title race, as Manchester City could now be level on points with Arsenal if they win against Aston Villa on Sunday and then beat Mikel Arteta's side on Wednesday.