Hai.

I dont know if Im the only one but I cant save any mastery page (runepages are working properly). I got this "null" popout, and if i relog, all those newly created pages are gone. I get the same message when changing mastery pages on champ select, an cannot use any mastery page then. So its a little annoying.

EDIT> Screenshot

Got a full repair and the issue fixed, then i changed a mastery page's name and its all bugged again.

Bump, this is really annoying

same for me either

Glad im not alone!

Last bump, then ill just wait for a miracle

Bump...I have recently got this message and would be very happy if someone can help us out. It is working the same way as described above apart from my page is stuck on my ap carry page, and I still receive stats from it. If I try and change I get the Error:null and it does not change in game. Thanks in advance for any help that anyone can throw our way.

Did u got something dude?

I just had this and I think I fixed it. Mine was caused by having mastery pages with the same name. Changed the name of the duplicates, error went away!

I just fixed this on my end. Two of my mastery pages had the same name - renaming them to have different names caused the null error to stop happening and allow me to save masteries properly.