msco server does not check for None in certain circumstances

Server log shows, e.g.
Traceback (most recent call last):
  File "/home/mss-demo/miniconda3/envs/stable/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/mss-demo/miniconda3/envs/stable/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/mss-demo/miniconda3/envs/stable/lib/python3.7/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/mss-demo/miniconda3/envs/stable/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/home/mss-demo/miniconda3/envs/stable/lib/python3.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/mss-demo/miniconda3/envs/stable/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/mss-demo/miniconda3/envs/stable/lib/python3.7/site-packages/mslib/mscolab/server.py", line 88, in wrapper
    return func(*args, **kwargs)
  File "/home/mss-demo/miniconda3/envs/stable/lib/python3.7/site-packages/mslib/mscolab/server.py", line 214, in add_permission
    u_id = User.query.filter_by(username=username).first().id
AttributeError: 'NoneType' object has no attribute 'id'
WARNING:engineio.server:Invalid session 2edca1db05de425da9bbf418bc3eb233
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