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PyOpenGL 3.1.6

When I close the window, I get an "Invalid operation" error in resizeGL() on the line with the glViewport() function. This happens with PyQt6 and PySide6.

import sys
from OpenGL.GL import *
from PyQt6.QtCore import Qt
from PyQt6.QtOpenGL import QOpenGLWindow
from PyQt6.QtWidgets import QApplication
class OpenGLWindow(QOpenGLWindow):
    def __init__(self):
        super().__init__()
    def initializeGL(self):
        glClearColor(0.2, 0.2, 0.2, 1)
    def resizeGL(self, w, h):
        glViewport(0, 0, w, h)
    def paintGL(self):
        glClear(GL_COLOR_BUFFER_BIT)
if __name__ == "__main__":
    QApplication.setAttribute(Qt.ApplicationAttribute.AA_UseDesktopOpenGL)
    app = QApplication(sys.argv)
    w = OpenGLWindow()
    w.show()
    sys.exit(app.exec())
Debugging details:
Traceback (most recent call last):
  File "E:\_Projects\OpenGL\basic-examples\animations\set-swap-interval-opengl21-pyqt6-python\opengl_window.py", line 15, in resizeGL
    glViewport(0, 0, w, h)
  File "E:\ProgramFiles\Python\Python38\lib\site-packages\OpenGL\error.py", line 230, in glCheckError
    raise self._errorClass(
OpenGL.error.GLError: GLError(
        err = 1282,
        description = b'invalid operation',
        baseOperation = glViewport,
        cArguments = (0, 0, 160, 160)