mystery champion token

what happened was i went to buy a mystery champion shard and it worked the first time i tried again and it gave me an unkown error and repeatedly did this then i did a league game and tried again. this time it worked so i went to my hextech crafting page and had it plus every single one i had an error for so i ended up with 5 for the price of one. I thought you might want to know before someone trys to abuse it if it happens again