TFT freeze bug

What happened was I was at the end of a round, and we both started off with 5 people a piece, we were both down to 2, all of a sudden my warwick attacks the enemy champion in the back and just stops. And sits there for the remainder of the round without doing a single thing. Now at first I figured maybe he was stunned, but he wasn't, there were no effects on him what so ever but more importantly he sat there for a good 20 seconds without so much as moving, you guys need to get on that bug because it not only cost me the round but more than likely the game.