Please fix Yorick's Ult!!!

I can't play a game of League without 's ult bugging out because I target myself to activate it, but nothing happens. I'm not stunned and I didn't target an ally, my ult just didn't activate. This has not just happened once, it happens every single time i'm in a teamfight. It even happens before I enter a teamfight. Please fix this bug Riot, it makes the game very unenjoyable and very frustrating.