Почему выдает ошибку (QObject::connect: Cannot queue arguments of type 'QTextCharFormat' (Make sure 'QTextCharFormat' is registere), но работает?

QObject::connect: Cannot queue arguments of type 'QTextCharFormat'
(Make sure 'QTextCharFormat' is registered using qRegisterMetaType().)
QObject::connect: Cannot queue arguments of type 'QTextCursor'
(Make sure 'QTextCursor' is registered using qRegisterMetaType().)

import sys
import threading
from PyQt5 import QtWidgets, QtCore, QtGui
import logging


def thread(func):
    """threading"""

    def wrapper(*args, **kwargs):
        my_thread = threading.Thread(target=func, args=args, kwargs=kwargs)
        my_thread.start()

    return wrapper


class QTextEditLogger(logging.Handler):
    """logging update"""
    def __init__(self, parent):
        super().__init__()
        self.widget = QtWidgets.QTextEdit(parent)
        self.widget.setReadOnly(True)
        self.widget.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)

    def emit(self, record):
        msg = self.format(record)

        if record.levelname == 'BET':
            self.widget.setTextColor(QtGui.QColor(26, 122, 19))

        elif record.levelname == 'UPDATE':
            self.widget.setTextColor(QtGui.QColor(30, 53, 158))

        elif record.levelname == 'MESSAGE':
            self.widget.setTextColor(QtGui.QColor(244, 66, 83))

        elif record.levelname == 'UPDATE BET':
            self.widget.setTextColor(QtGui.QColor(201, 115, 30))

        else:
            self.widget.setTextColor(QtGui.QColor(0, 0, 0))

        self.widget.append(msg)
        self.widget.ensureCursorVisible()


class MyDialog(QtWidgets.QDialog):

    def __init__(self, parent=None):
        super().__init__(parent)

        self.logTextBox = QTextEditLogger(self)
        self.logTextBox.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s', "%H:%M:%S"))
        logging.getLogger().setLevel(logging.INFO)

        self._button = QtWidgets.QPushButton(self)
        self._button.setText('message')

        layout = QtWidgets.QVBoxLayout()
        layout.addWidget(self.logTextBox.widget)
        layout.addWidget(self._button)
        self.setLayout(layout)

        self.log_update('WELCOME AUCTION BOT ')
        self._button.clicked.connect(lambda: self.log_message('AUCTION BOT '))

    @thread
    def log_update(self, text):
        """log format update """
        UPDATE = 35
        logging.getLogger().addHandler(self.logTextBox)
        logging.addLevelName(UPDATE, 'UPDATE')
        assert logging.getLevelName(UPDATE) == 'UPDATE'
        logging.log(UPDATE, text)

    @thread
    def log_message(self, text):
        """log format message """
        MESSAGE = 45
        logging.getLogger().addHandler(self.logTextBox)
        logging.addLevelName(MESSAGE, 'MESSAGE')
        assert logging.getLevelName(MESSAGE) == 'MESSAGE'
        logging.log(MESSAGE, text)


app = QtWidgets.QApplication(sys.argv)
dlg = MyDialog()
dlg.show()
dlg.raise_()
sys.exit(app.exec_())