When opening the xlsx written by a reader containing Nan, it will prompt that there is a problem with the content.

[yiyinghu97]

static async Task Main(string[] args)
    {
        var path = Path.Combine("D:\\Document\\errorCSV", $"{Guid.NewGuid()}.xlsx");
        var table = new DataTable();
        {
            table.Columns.Add("Column1", typeof(double));
            table.Columns.Add("Column2", typeof(double));
            table.Rows.Add(1.0, double.NaN);
        }
        MiniExcel.SaveAs(path, table);