pyusb: OSError with wxPython

If I try to find the USB devices in a wxPython window, I get the following error:

Exception ignored in: <bound method _AutoFinalizedObjectBase.__del__ of <usb.backend.libusb1._Device object at 0x04307210>>
Traceback (most recent call last):
  File "C:\Users\guest\AppData\Local\Programs\Python\Python36-32\lib\site-packages\usb\_objfinalizer.py", line 84, in __del__
    self.finalize()
  File "C:\Users\guest\AppData\Local\Programs\Python\Python36-32\lib\site-packages\usb\_objfinalizer.py", line 144, in finalize
    self._finalizer()
  File "C:\Users\guest\AppData\Local\Programs\Python\Python36-32\lib\weakref.py", line 548, in __call__
    return info.func(*info.args, **(info.kwargs or {}))
  File "C:\Users\guest\AppData\Local\Programs\Python\Python36-32\lib\site-packages\usb\_objfinalizer.py", line 104, in _do_finalize_object_ref
    obj._do_finalize_object()
  File "C:\Users\guest\AppData\Local\Programs\Python\Python36-32\lib\site-packages\usb\_objfinalizer.py", line 71, in _do_finalize_object
    self._finalize_object()
  File "C:\Users\guest\AppData\Local\Programs\Python\Python36-32\lib\site-packages\usb\backend\libusb1.py", line 604, in _finalize_object
    _lib.libusb_unref_device(self.devid)
OSError: exception: access violation writing 0x00000014
^C

Here is some simple code that can create the error.

import wx
import usb

class MyForm(wx.Frame):
	def __init__(self):
		wx.Frame.__init__(self, None, wx.ID_ANY, "Example")
		panel = wx.Panel(self, wx.ID_ANY)
		sizer = wx.BoxSizer(wx.VERTICAL)

		button = wx.Button(panel, label="Run test()")
		button.Bind(wx.EVT_BUTTON, self.test)
		
		sizer.Add(button, 0, wx.ALL|wx.CENTER, 5)
		panel.SetSizer(sizer)

	def test(self, event):
		valueList = []
		devices = usb.core.find(find_all=True)
		for config in devices:
			valueList.append((config.idVendor, config.idProduct))
		print(valueList)

		event.Skip()

if __name__ == "__main__":
	app = wx.App(False)
	frame = MyForm()
	frame.Show()
	app.MainLoop()

To produce the error, press the button “Run test()” in the frame that appears after running the code.