[Client] Inaccurate Post-Game Statistics for Yorick After ARAM-Queued Game

Played a game on Howling Abyss (ARAM queue) and the post-game stats showed Yorick's damage dealt (overall and to champions), as well as damage taken being over 500,000. Unfortunately, I have no idea why this bug occurred and I have never seen it before. As this was ARAM, I don't really have any steps to reproduce it. Here are the images I captured: http://imgur.com/a/JGdnA