Can we please fix Karthus already ? (VO Bug)

As you may know Riot, Karthus has gone completely silent (VO not working, he doesnt talk in-game) for more than a week now. Now I know he is nowhere as popular as but that doesn't mean he'll have to wait till the next patch in order to get fixed. I feel discouraged to pick my beloved karthus just because of this issue.

When can we expect a fix for this ?