[GAMEPLAY]Gragas can't activate his Q

I was playing a Gragas game on my account. The game went smooth but i noticed that my Q didnt want to activate everytime, but i was not concerned because it was my missplay. After like 30 minutes of playing we lost a baron fight and I pressed q like 30 times and it just couldnt trow the barrel out. After I respawned I pressed Q and nothing happend, so i look at my Q ability and it said Cost 0 mana, cooldown 0, and looked like it was stuck on activating the barrel but there was no barrel to be activated so it got stuck. And in the end i finished this 40 minute game with a victory, that i dont know how i managed without using Q for last 10 minutes. Cheers Bátman.