PySide2.QtWidgets.style() crashes

class Form(QtWidgets.QDialog):
    def __init__(self, parent=None):
        super(Form, self).__init__(parent)
       
        layout = QtWidgets.QVBoxLayout()
        layout.addWidget(QtWidgets.QLineEdit("Hello"))
        self.setLayout(layout)

        print("About to print style()")
        print("Form Style %s" % (self.style()))
        
form = Form(parent_widget)
form.show()