Manchester United supporters reacted with fury after goalkeeper David de Gea produced another error to allow West Ham to take the lead.
De Gea has found himself increasingly under the spotlight in recent weeks and months with debate raging over whether or not the club should offer him a new contract.
The Spaniard did little to help his case to remain as the club's No 1 with another egregious mistake, gifting Said Benrahma a goal.
Benrahma was released by Michail Antonio and ran at the United backline, though surrounded by a number of defenders he appeared to have a difficult job on his hands finding the back of the net.