Montpellier stay 14th on 12 points after failing to beat second-bottom Troyes.
Younes Belhanda put the champions ahead with a low cross-shot in the 19th minute, only for Fabien Camus to level five minutes before the interval.
2011 champions Lille had no such problems as they claimed a 2-0 win at Evian Thonon Gaillard.
St Etienne beat PSG 2-1 but stay fifth on 18 points, behind Valenciennes on goals scored after the northern side continued their good run as they moved up to fourth with a 3-1 home win against Sochaux.
Foued Kadir opened the scoring with a free kick in the 12th minute and set up Gregory Pujol for the second 15 minutes later.
Pujol put the result beyond doubt on the hour mark, beating Simon Pouplin from close range after being set up once again by Kadir.
Sebastien Roudet scored a consolation goal two minutes later.
Lille moved up to seventh, a point behind St Etienne, after a Nolan Roux header and 25-metre strike from Florent Balmont gave them a 2-0 win at Evian Thonon Gaillard.
Second-placed Toulouse and third-placed Marseille, who are both three points behind PSG, travel to Bordeaux and AC Ajaccio respectively on Sunday.
- Sports & Recreation