Kaitlin Olson broke a rib filming last week's The Mick episode

TheWrap

"It was so stupid," she says of her injury, which happened when she was trying to throw a rock onto a car. "I had to reach a little bit further to get the windshield and I smashed my rib on the front corner of the car. It was just the easiest, quickest little thing but it took about eight weeks before I could sleep well again.” ALSO: Olson talks about Tuesday's Season 2 finale.