while executing "ftdi_urls.py" i get following error:

Traceback (most recent call last):
File "/home/bob/.local/bin/ftdi_urls.py", line 74, in
main()
File "/home/bob/.local/bin/ftdi_urls.py", line 62, in main
Ftdi.show_devices()
File "/home/bob/.local/lib/python3.8/site-packages/pyftdi/ftdi.py", line 387, in show_devices
devdescs = UsbTools.list_devices(url or 'ftdi:///?',
File "/home/bob/.local/lib/python3.8/site-packages/pyftdi/usbtools.py", line 274, in list_devices
candidates, _ = cls.enumerate_candidates(urlparts, vdict, pdict,
File "/home/bob/.local/lib/python3.8/site-packages/pyftdi/usbtools.py", line 417, in enumerate_candidates
devices = cls.find_all(vps)
File "/home/bob/.local/lib/python3.8/site-packages/pyftdi/usbtools.py", line 95, in find_all
devs.update(UsbTools._find_devices(vid, pid, nocache))
File "/home/bob/.local/lib/python3.8/site-packages/pyftdi/usbtools.py", line 620, in _find_devices
devs.add(device)
TypeError: unhashable type: 'Device'

my setup is:
ubuntu 20.04
Python 3.8.10 (default on ubuntu)
pyftdi 0.53.1 (installed by pip)
pyusb 1.2.0 (installed by pip to fulfill dependencies)