Katarina attacking allied Gangplank barrels

So recently or so I was in a ranked game just playing some ranekd with Katarina. I remember cleary that I had a gangplank on my team. Just wanted to say that everytime Gangplank would put a barrel down I would Shunpo out of the fight then i'd start randomly attacking it? Please fix this bug because i died sometimes because i'd Shunpo out and randomly attack it !