Formatted numbers with $.fn.dataTable.render.number are not negative anymore

Hi,

I do not know if I missed something or if this is a bug but when I format numbers with $.fn.dataTable.render.number the negative symbol "-" disappears.

Here my table configuration :

campagnes.DataTable({
    data: dataSet,
    deferRender: true,
    fixedHeader: true,
    columnDefs: [
        {targets: 7, render: $.fn.dataTable.render.number( ' ', ',', 2, '', ' €' ) },
        {targets: [5,6], render: $.fn.dataTable.render.number( ' ', ',', 0, '', ' €' ) },
        {targets: [3,4,5,6,7], className: 'text-right'},
        {targets: [1,8,9,10], className: 'text-left'}
    ]
});

Thanks for your help !