Nil date error

Hello,
I don’t understand the problem.

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Try
  rowsFound = app.db.SelectSQL("select * from Dokumente where Datum > '01.01.2010' order by Datum asc")
  For Each row as DatabaseRow in rowsFound
    If rowsFound <> Nil Then
      If row.Column("Datum").Value <> Nil Then
        MessageBox(row.Column("Datum")) // shows first date from Dokumente correctly
          var dat As Date = Row.Column("Datum").DateValue // No Errors in Code but crashes with dat = NIL // 'DateTime.Now' works!
        Label_date.Text = dat.SQLDate // Convert to yyyy-mm-dd and set to 'Label_date.Text'
        ListBox1.AddRow(row.Column( "Bezeichnung").StringValue, Label_date.text, row.Column( "Name").StringValue, row.Column( "Betrag").StringValue, row.Column( "ID").StringValue) // OK
      Else
        ListBox1.AddRow ""
      End If
    End if
  Next
Catch error as DatabaseException
  MessageBox("Error")
End Try

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