Mastery Page selection bug

i see you fixed mastery page name change bug. but what about the bug that causes your mastery pages in champ select to appear as your friend's mastery pages after recently looking at that person's mastery pages in their profile, and you cant select any of them because it gives you an error message saying "there is no error message for this error" cuz the client doesnt even understand what is wrong here, then it just uses your last used mastery page since you didnt choose anything because you couldnt.. i had to play a lux game with my adc mastery page because of this, fervor for battle lux is not fun. please fix.

this problem may occur with runes, im not about to test it tho. it also may not have a 100% chance to happen. that same friend whom i stole mastery pages from had the same problem when he looked at my mastery pages.