Luton goalkeeper Simon Sluga missed a to present Derby a goal from the Rams 2-0 win in Pride Park.
Sluga must have comfortably dealt with Matt Pearsons ball into his feet, but he let it roll into the net to hand their opening goal in the 11th minute to Derby and beneath him.
It was the hottest in a string of errors from Sluga, that has had a challenging start to life after coming in the summertime in Kenilworth Road.
It goes from bad to worse for Sluga and Luton, since Tom Lawrence struck to secure Derbys success from the Sky Bet Championship clash
Hit play on the video at the top of the webpage to watch Slugas clanger.