QTreeView and itemDelegate code

This code worked just fine some months ago (maybe half year), and now it's not working. Why could it be? Message error is ''NoneType' object has no attribute 'style'' from line 12.

Code:

def paint(self, painter, option, index):
        if not index.isValid():
            return
        painter.translate(0, 0)
        options = QStyleOptionViewItemV4(option)
        self.initStyleOption(options, index)
        painter.save()
        painter.setRenderHint(QPainter.Antialiasing, True)
        doc = QTextDocument()
        doc.setHtml(options.text)
        options.text = ""
        options.widget.style().drawControl(QStyle.CE_ItemViewItem, options, painter, options.widget)  #<---ERROR
        painter.translate(options.rect.left() + self.sizeDp(index) + 3, options.rect.top()) #paint text right after the dp + 3pixels
        rect = QRectF(0, 0, options.rect.width(), options.rect.height())
        doc.drawContents(painter, rect)
        painter.restore()

Why could this be happening?