Couldn't Ban

I was in a ranked que, and it was my turn to ban, it wasn't selecting a champ. I was trying to click on amumu, but after he wasn't selecting, I started panicking and clicking on everybody I could, but nothing happened. I was still able to talk to my team, so I wasn't lagging, and they were talking back, but it just wasn't letting me select my character. Just lost my promos cause of it, now I'm pissed.