mastery pages while in champ select

alright so i was in champ select deleting mastery pages to no only clean up but to make room for the one i was gonna make. well when it gave me the question are u sure you want to delet this page someone dodged the champ select leaving me with that question still on the screen but the problem was i couldnt say yes or no...neither could i predd anything on the screen. i ended up restarting league and its ok now but just thought that you guys should know bout this.