Sergio Ramos was sent off for the 28th time in his career as Paris St-Germain were held by Reims.
The former Real Madrid defender was shown two yellow cards in quick succession for arguing with the referee shortly before half-time.
PSG, without the injured Lionel Messi, needed a good save from Gianluigi Donnarumma to deny Arber Zeneli.
But Neymar missed a golden chance to win it for PSG when he ran through but somehow shot wide.
Things got feisty towards the end as the visitors appeared to get frustrated, with Neymar and Kylian Mbappe both booked for fouls.
It is only the second time this season the Ligue 1 leaders, who are three points ahead of second-placed Marseille, have dropped points.
Reims, who have won just once in 10 games so far this season, are 14th.
Credit: bbc.com
