Sejuani W bug

Hey guys, I was just recently playing a sejuani game. I find her fun and a really good tank. 45 minutes into the game, I ran into this bug. My w woundnt cast. I would click my w and nothing would happen. it was just like a normal basic attack. we almost lost the game because of this bug but luckily we didn't. if I can recreate this bug again I will make another post. but for now just try to avoid playing sejuani for fear of this bug.