[Client] Negative True Damage

Not sure if something new or not, but I just ended an aram where a Shen did negative true damage.

The match ID is 394720986 on LAS server.

This are the Shen stats I've got with Riot's API:

     "stats": {
        "unrealKills": 0,
        "item2": 3065,
        "item1": 0,
        "totalDamageTaken": 29055,
        "item0": 1028,
        "pentaKills": 0,
        "sightWardsBoughtInGame": 0,
        "winner": false,
        "magicDamageDealt": 5689,
        "wardsKilled": 0,
        "largestCriticalStrike": 0,
        "trueDamageDealt": -2147483648,
        "doubleKills": 0,
        "physicalDamageDealt": 9468,
        "tripleKills": 0,
        "deaths": 10,
        "firstBloodAssist": false,
        "magicDamageDealtToChampions": 2308,
        "assists": 16,
        "visionWardsBoughtInGame": 0,
        "totalTimeCrowdControlDealt": 97,
        "champLevel": 14,
        "physicalDamageTaken": 9517,
        "totalDamageDealt": -2147483648,
        "largestKillingSpree": 0,
        "inhibitorKills": 0,
        "minionsKilled": 14,
        "towerKills": 0,
        "physicalDamageDealtToChampions": 4964,
        "quadraKills": 0,
        "goldSpent": 7550,
        "totalDamageDealtToChampions": 7273,
        "goldEarned": 9176,
        "firstBloodKill": false,
        "firstTowerKill": false,
        "wardsPlaced": 0,
        "trueDamageDealtToChampions": 0,
        "killingSprees": 0,
        "firstInhibitorKill": false,
        "totalScoreRank": 0,
        "totalUnitsHealed": 1,
        "kills": 4,
        "firstInhibitorAssist": false,
        "totalPlayerScore": 0,
        "magicDamageTaken": 18364,
        "largestMultiKill": 1,
        "totalHeal": 1647,
        "item4": 0,
        "item3": 3083,
        "objectivePlayerScore": 0,
        "item6": 2052,
        "firstTowerAssist": false,
        "item5": 0,
        "trueDamageTaken": 1172,
        "neutralMinionsKilled": 0,
        "combatPlayerScore": 0
     },

Just though I should report it.