There's a game in my match history that I didn't play

League of Legends Match History
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I just came back to my account after not having played in a while and I noticed this game in my match history. As you can see, I was afk from the start, didn't buy items and didn't kill minions. The strange thing is, I am 100% sure that I didn't play that game. I was quite sure that my last game was with Janna, and I haven't played Gragas in months. Luckily, the game didn't count as a leave, but it still bugs me. Does anyone know how this could happen?
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