Cloud Script UpdatePlayerStatistics

handlers.UpdateTotalRanking = function(args){
    var result = server.GetPlayerProfile( {PlayFabId: currentPlayerId, ProfileConstraints: {ShowLocations: true}} );
    var profile = result.PlayerProfile;
    var gameMode = args.gameMode;
    var totalScore = 0;
    debug.log(profile.Statistics.Count);
    var i = 0;
    for(i;i<profile.Statistics.Count;i++){
        var name = profile.Statistics[i].Name;
        debug.log(name);
        if(name.includes(gameMode)){
            debug.log("TRUE");
            totalScore+=profile.Statistics[i].Value;
        }
    }
    if(totalScore>0){
        log.info("UPDATETOTALSCORE");
        var req = {
            PlayfabId:currentPlayerId,
            Statistics : [{
                StatisticName : "TotalRank"+gameMode,
                Value : totalScore
            }]            
        }
        return server.UpdatePlayerStatistics(req);
    }
        return profile;
};

When user statistics are updated, I want to set the sum of other statistics to total ranking. But this code doesn't work. I want your help.