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CreateCellComment gives System.ArgumentException: An item with the same key has already been added.

May 6, 2013 at 12:23 PM
This happens only in some cells now and my template worked fine before this few weeks.
  public static void SetComment(ref ISheet w, int row, int col, string text)
        catch (Exception ex) {

        if (text != "")

            if (col < 200)
                    IDrawing d = w.CreateDrawingPatriarch();
                    IComment comment = d.CreateCellComment(new HSSFClientAnchor(0, 0, 0, 0, col, row, col + 4, row + text.Split('\n').Length));
//Exception happens above
                    comment.Author = "CRM";
                    comment.String = (new HSSFRichTextString(text));
                    if (w.GetRow(row).GetCell(col) != null) w.GetRow(row).GetCell(col).CellComment = comment;

Stack trace:

at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)
at System.Collections.Generic.Dictionary
2.Add(TKey key, TValue value)
at NPOI.HSSF.Record.EscherAggregate.AddTailRecord(NoteRecord note)
at NPOI.HSSF.UserModel.HSSFComment.AfterInsert(HSSFPatriarch patriarch)
at NPOI.HSSF.UserModel.HSSFPatriarch.OnCreate(HSSFShape shape)
at NPOI.HSSF.UserModel.HSSFPatriarch.CreateComment(HSSFAnchor anchor)
at NPOI.HSSF.UserModel.HSSFPatriarch.CreateCellComment(IClientAnchor anchor)
at CashflowUpdater.XSSFProgram.SetComment(ISheet& w, Int32 row, Int32 col, String text) in

What could be wrong?