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. 

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Attachment: custom_env.txt
Description: audio/mpeg

Attachment: base_env.txt
Description: audio/mpeg

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