Ole Gunnar Solskjaer insists Manchester United's home form is due to an empty Old Trafford.
They have not won any of their last six Premier League games at Old Trafford, losing three and drawing one this season as they prepare for the visit of West Brom.
Solskjaer said: “We've had four home games in the league. The first one we didn't have any preparation and Palace deserved it.
“Then Anthony Martial did not deserve to be sent off against Tottenham but, after he was, they deserved the win.
“Then both the Chelsea and Arsenal games were very tight and if we had our fans might they might have sparked that little extra X Factor we needed.
“It's a different sensation playing in front of the Stretford End without fans, they usually score a goal for us.
“It's something we want to correct and hopefully we'll get our first win against West Brom."