Yorick Ult bug

Dear Riot Team, I had much fun with ad Yorick top but last Game was just lame. Since around min 15 my midlaner roamed top and i Ulted him in the last Moment. The Ult did nothing and since then my ult was frozen on 0 cooldown ... Hope this will be fixed beacause playing a game without Ult is really lame. By the way i tried relogging :D it was useless.