bug in champion select??

it was my turn to ban a champion and i couldnt pick any champion to ban it wasnt letting me, i just got in promos and because i couldnt pick a champ to ban now it counts as a loss?? really? now i am getting spammed about an unknown error that has been sent to you, will u remove the "loss" from my promos or now i have to win 2 games in a row?