Veigar skin bug

While I was in champion select with my friends, I clicked on Veigar as if I was going to lock him in, but then the message in the chat "Veigar Greybeard skin has been unlocked for you this game" popped up. At first I thought I had accidentally bought the skin, but that would be impossible, as I was still on champ select. In the end, I didn't get the skin and no rp was removed from my account. Also, before anyone asks, none of my friends used a skin boost, as an additional 100 ip was not rewarded that game. Although it was a harmless glitch it gave me a mini-heartattack. In the image, you can see the message in the chat.