THE CAR SEAT WARMER IN THE BACK OF THE CAR CAUGHT ON FIRE WHILE OUR SEVEN YEAR OLD WAS ASLEEP IN THE CAR. HE WAS IN HIS BOOSTER SEAT. THE SEAT WARMER WAS NOT ON. (THIS WAS IN AUGUST 2018.) WE SMELLED A BURNING SMELL AND THERE WAS A SMOLDERING FLAME UNDER HIS LEGS. THE CAR WAS STATIONARY, NOT IN MOTION. IT WAS IDLING IN A PARKING LOT.