Pompey’s season hit a low as they went down to a 1-0 defeat to Oldham.
An own goal from new-boy Johnny Ertl settled it on a day to forget for the Blues at Fratton Park.
The key moment arrived after 59 minutes when Ertl turned Lee Croft’s cross past Mikkel Andersen.
But the referee, Carl Berry, played a key role in the game in a terrible display of officiating.
He sent off Jordan Obita and Oldham’s Cliff Byrne - in an apparent case of mistaken identity.
Obita walked following a second-half tussle with Connor Brown, but the ref sent off the wrong man for the away side.
The referee never had control of a game, with the visitors outmuscling Pompey.
Obita missed a one on one after four minutes and Darel Russell fired the Blues’ other decent first-half chance wide.
Cristian Montano hit a post four minutes after the restart before chaos kicked in.
Pompey pressed at the death but never really looked like getting a leveller on a frustrating afternoon.