Fortunately I was on my final ‘lighter’ sets of 178kg squats when I walked in with a different stance to usual, missed the left J peg, thought I had it on the second attempt, let go as it then pulled me down to the side. I got off lightly due to the safety bar that caught it with just a minor bump on my head that mostly landed on the muscle at the top of my neck and a slightly sensitive shoulder.
As long as you're OK!