I'm using spagobi to get data from mongodb. the problem is that the result includes some none using character . my query is:

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sbiDatasetfixedResult ={value : db.getCollection('test').aggregate(
[
{$match:{user_id :4}},
{$group:{_id: 0, value: {$sum: "$value" } } },
{$project: { _id: 0, value: 1 } }
]
)};

the result of code above
Nom : KqU3p.jpg
Affichages : 35
Taille : 5,7 Ko

but i need like this form
Nom : 3sKDT.jpg
Affichages : 28
Taille : 5,8 Ko