Spyder-notebook 0.3.0 crashed in a custom environment

[Volodymyr Holomb]

Hi there!

All of a sudden I faced a problem of not working spyder-notebook plugin in a custom environment. More specifically any attempt to open existing ipynb file ends up with a white frozen tab and throws following errors:

File "C:\Users\<user_name>\.conda\envs\env_qfl\lib\site-packages\spyder_notebook\widgets\client.py", line 272, in get_session_url return self.add_token(url_path_join(self.server_url, 'api/sessions')) File "C:\Users\<user_name>\.conda\envs\env_qfl\lib\site-packages\notebook\utils.py", line 50, in url_path_join initial = pieces[0].startswith('/') AttributeError: 'NoneType' object has no attribute 'startswith'

See attached list of packages in a custom environment.

At the same time, the same very notebook(-s) works fine in the base environment.

An error was detected after the recent win-10 update, and as far as I can trace is not connected with any update of packages in a custom environment.

I've already tried to reinstall spyder and spyder-notebook plugins, but it doesn't help.