Edinson Cavani had handed Laurent Blanc's men the lead before an unfortunate moment for the goalkeeper left them with a solitary point.An own goal from Salvatore Sirigu cost Paris Saint-Germain the chance to go top of Ligue 1 as it was held to a 1-1 draw by Lille on Wednesday.
Sirigu's error shortly before the interval proved costly for Laurent Blanc's men, who had led through Edinson Cavani, as they stayed second and a point behind Olympique de Marseille.
PSG had won the previous nine matches in all competitions and, after a rocky start, were ahead 29 minutes in against struggling Lille as Cavani finished Ezequiel Lavezzi's dangerous cross from the left.
The champion was unable to take that lead into the break, however, as Sirigu failed to deal with David Rozehnal's header - clumsily fumbling the ball into his own net.
With first place at stake following Marseille's draw with Lorient on Tuesday, Blanc's side could not find a winner in the absence of rested striker Zlatan Ibrahimovic.
Despite its woeful recent form, the host had three opportunities to take the lead in the very first minute of the match.
Sirigu's terrific double save denied Divock Origi and then Nolan Roux before the ball broke loose to Florent Balmont, who could only hit the post.
Origi and Roux continued to threaten PSG's back line, which included Gregory van der Wiel and Maxwell at the expense of Lucas Digne and Serge Aurier, although Lucas Moura's low drive tested Vincent Enyeama at the other end inside the opening 10 minutes.
Cavani then wasted a gilt-edged opportunity as he sidefooted Maxwell's cutback wide from inside the area, with Lille's bright start fading before the half-hour mark.
Conversely, PSG grew into the game and duly took the lead through Cavani.
After a purposeful burst infield from Lucas, the Brazilian played in Lavezzi to cross with Cavani applying the finish for his seventh league goal of the campaign.
While Balmont's withdrawal because of an apparent foot injury looked set to cap a disappointing half for Girard's men, a slightly fortuitous equalizer brightened the mood at the Stade Pierre Mauroy.
Rozehnal's glanced header was fumbled by Sirigu, with neither the goalkeeper nor Javier Pastore on the post able to keep it out.
Lille started the second half on top - Origi and Simon Kjaer both testing Sirigu - before a looping run from Lucas allowed the PSG man strike the underside of Enyeama's crossbar.
Blanc then gave Marco Verratti his first taste of action since November's win over Marseille off the bench following an adductor injury, but the Italian could not lift a below-par PSG and it was forced to settle for a point.