City led through Kevin De Bruyne’s 38th-minute opener when Zlatan Ibrahimovic equalised in the 41st minute.
The goal took a massive slice of luck, with the Swedish superstar profiting from some hideous defensive play on the part of the Citizens.
Hart passed the ball out to midfielder Fernando, but the midfielder’s wayward first touch allowed the Swedish superstar to step in and deflect his pass past Hart, who watched on immobile from the goal line.
“It was a terrible first goal for us to concede after being 1-0 up,” the goalkeeper admitted to the media, as per BT Sport, after the match.
“I have given Fernando the ball and he obviously thought there was an option to pass inside,” the stopper continued, attempting to explain the aberration, “and the big man put his size 15s on it and in it went.
“We don’t want that to mask over a good performance, we made mistakes tonight, they did and it was an exciting game.”
PSG extended their lead through Adrien Rabiot 14 minutes after the break, and while Hart regained some measure of credibility with a penalty save from Zlatan, City were forced to settle for a draw when Fernandinho equalised in the 72nd minute.
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City are chasing history in the Champions League this season, having already reached the quarter-finals for the first time.
With two away goals, Hart and his teammates will surely be very confident of advancing to the semi-finals, even if they may well feel they ought to have taken a victory from the Parc des Princes.