Itext sharp print value from datagrid null c#

Some help pelease

Error line 48

If is value null error

{"Object reference not set to an instance of an object."}

System.NullReferenceException

System.Windows. Forms.DataGridViewCelll.Value.get returned null

Some help?

private void pdfButton_Click(object sender, EventArgs e)
{
//Creating iTextSharp Table from the DataTable data
PdfPTable pdfTable = new PdfPTable(prijava_radnikaDataGridView.ColumnCount -1);
pdfTable.DefaultCell.Padding = 3;
pdfTable.WidthPercentage = 100;
pdfTable.HorizontalAlignment = Element.ALIGN_CENTER;
pdfTable.DefaultCell.BorderWidth = 1;
//float[] widths = new float[] { 0f, 18f, 40f, 35f, 35f, 25f, 25f, 18f, 40f, 35f };
//pdfTable.SetWidths(widths);
BaseFont bfCalibri = BaseFont.CreateFont("c:\\windows\\fonts\\calibri.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
iTextSharp.text.Font calibri = new iTextSharp.text.Font(bfCalibri, 10, iTextSharp.text.Font.NORMAL, iTextSharp.text.BaseColor.WHITE);
iTextSharp.text.Font calibri2 = new iTextSharp.text.Font(bfCalibri, 9);
//Adding Header row
foreach (DataGridViewColumn column in prijava_radnikaDataGridView.Columns)
{
if (column.Index == 1)
{
}
else
{
PdfPCell cell = new PdfPCell(new Phrase(column.HeaderText, calibri));
cell.BackgroundColor = new BaseColor(89, 135, 178);
cell.VerticalAlignment = Element.ALIGN_MIDDLE;
pdfTable.AddCell(cell);
}
}
//Adding DataRow
foreach (DataGridViewRow row in prijava_radnikaDataGridView.Rows)
{
foreach (DataGridViewCell cell in row.Cells)
{
if (cell.ColumnIndex == 1 )
{
PdfPCell cell2 = new PdfPCell(new Phrase(cell.Value.ToString().Split(' ')[0], calibri));
pdfTable.AddCell(cell2);
}
else
{
PdfPCell cell2 = new PdfPCell(new Phrase(cell.Value.ToString(), calibri));
pdfTable.AddCell(cell2);
}
}
}
etc.....code....<<
}