Jhin's invisible Ultimate bullets

I've played a couple of games against a Jhin recently, and I've come across this error in both games. The first (on ARAM) I was at low health when Jhin ulted. I was completely ready to dodge the last bullet, but all of a sudden I died without seeing anything. Then in a normal game recently, the same thing happened to my ally as I was trying to see if I could block the bullet, but again the bullet never showed up. I wasn't the only one to see this either, one of my other teammates noticed it too.