Team Builder 'Masteries' Bug

Okay so I was about to start a game of team builder and I decided to check out my friend's profile before i changed my runes and masteries. I found that if I went to their 'Masteries' tab on their profile and clicked on one of their mastery pages and then clicked on the home button to go back to the team builder screen, my masteries will disappear to make room for their masteries. However, when you select one of their masteries, you get an error message stating "Error: A suitable error message could not be found." It's a very minor bug, but i stumbled upon it and wanted to share it. Thanks for your time.

Your future president, President Yeezy