File "/usr/lib/python3/dist-packages/odoo/addons/website/models/ir_http.py", line 317, in binary_content
    access_mode=access_mode, env=env)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_http.py", line 365, in binary_content
    mimetype = guess_mimetype(base64.b64decode(content), default=default_mimetype)
  File "/usr/lib/python3.5/base64.py", line 88, in b64decode
    return binascii.a2b_base64(s)
binascii.Error: Incorrect padding - - -

SOLUCAO : o problema pode estar com o favicon do website, modulo website. Redefina-o ou apague em banco.
update website set favicon=null;
fonte : https://github.com/odoo/odoo/issues/33082