Strange printing problem

[porterneon]

Hi
I'm using QTextEditor to format text for printing. After that I'm sending this text as html QString to print method.
On PrintButton click: emit signal_PrintFormatedText(htmlText);

Inside print method I have:

QPrinter printer;
        printer.setOutputFormat(QPrinter::NativeFormat);
        printer.setDuplex(QPrinter::DuplexAuto);
        printer.setColorMode(QPrinter::GrayScale);
 
        QPainter painter(&printer);
 
        QTextDocument doc;
        doc.documentLayout()->setPaintDevice(painter.device());
        doc.setHtml(htmlFormatedText);
 
        QSizeF paperSize;
        paperSize.setWidth(printer.width());
        paperSize.setHeight(printer.height());
        doc.setPageSize(paperSize);
 
        doc.drawContents(&painter);

QPrinter printer;
        printer.setOutputFormat(QPrinter::NativeFormat);
        printer.setDuplex(QPrinter::DuplexAuto);
        printer.setColorMode(QPrinter::GrayScale);

        QPainter painter(&printer);

        QTextDocument doc;
        doc.documentLayout()->setPaintDevice(painter.device());
        doc.setHtml(htmlFormatedText);

        QSizeF paperSize;
        paperSize.setWidth(printer.width());
        paperSize.setHeight(printer.height());
        doc.setPageSize(paperSize);

        doc.drawContents(&painter);

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On first time (first printing) everything works fine. Problem is when I press PrintButton (in my app) once again. Printer prints some junk characters instead of first line of document.
What is the problem? How to fix it?