A bottle was thrown at Keylor Navas during Paris Saint-Germain's win at Montpellier on Saturday evening.
The Costa Rican goalkeeper wasn't hit by the bottle, which came from one of the stands housing the home supporters, but it did make him lose his balance.
After initially going behind in the game, PSG came back to win 3-1 with three goals in the space of seven minutes at the Stade de la Mosson.