Paris Saint-Germain were denied a half-time lead against Lille in Ligue 1 as goalkeeper Salvatore Sirigu spilled the ball into his own net three minutes before the break.
There was a lively start to the evening as both goalkeepers were tested early on, Divock Origi firing a warning shot for the hosts before Ezequiel Lavezzi came close for the champions.
PSG almost edged their noses in front with 11 minutes on the clock as Lavezzi's menacing corner found its way to Edinson Cavani in the box, but the Uruguayan shot over from a tight angle.
Cavani proved a handful for the Lille defence, and he came close again in the 21st minute, narrowly missing the top corner after collecting a pass from Maxwell.
Laurent Blanc's side asked all of the questions, threatening again in the 26th minute as Thiago Silva headed over from close range, and they forced the breakthrough they deserved in the 29th minute.
Lavezzi linked up well with Cavani, picking out his teammate in the Lille area with a deft pass, and the striker tucked an effort into the bottom corner from close range.
There was an unexpected turn of events with half time approaching, as Sirigu fumbled a corner into his own net to gift Lille an equaliser against the run of play.
