Ligue 1 referee Tony Chapron appeared to kick out at Nantes player Diego Carlos off the ball before showing the defender a red card in Paris Saint-Germain’s 1-0 win.
PSG were advancing up the pitch in the last minute of the match on a counter attack when Carlos seemed to accidentally cross paths with Chapron.
The referee stumbled and fell to the turf, before appearing swinging his right boot at the Nantes player in an attempted kick. After the ensuing coming together, referee Chapron gave Carlos a second yellow card, before blowing for full-time three minutes later.
Angel Di Maria had scored before the break to lift PSG, who were without the injured Neymar and Thiago Motta, 11 points clear of second-placed Monaco, who could only manage a goalless draw at Montpellier on Saturday.
PSG had enjoyed most of the possession and were quickly ahead as Di Maria scored from inside the box after collecting a low cross from Edinson Cavani in the 12th minute.
The Argentinian international then went close to doubling the lead for his team eight minutes before the interval but his shot from close range hit the bar.
Nantes themselves had a good chance early in the second half but Alphone Areola made a fine save to deny Emiliano Sala.
Meanwhile, third-placed Lyon are behind Monaco on goal difference after a 1-1 home draw against relegation-threatened Angers, with Nabil Fekir cancelling out Karl Toko Ekambi’s opener from the spot. Angers finished with 10 men when Flavien Tait was sent off for a second bookable offence six minutes from time.