LucaPrete opened a new issue #7825: Superset cannot start, reporting "AttributeError: 'NoneType' object has no attribute 'session' at startup" URL: https://github.com/apache/incubator-superset/issues/7825 I'm trying both Superset 0.20.6 and 0.28.1 (need to run them as containers, downloaded from dockerhub from `https://hub.docker.com/r/amancevice/superset`). At startup, both versions throw at some point an exception with the following error: `AttributeError: 'NoneType' object has no attribute 'session'` ### Expected results Superset start with no issues. ### Actual results Superset throws the following exception. Following is what I see using the 0.20.6 version. ``` superset | Loaded your LOCAL configuration at [/etc/superset/superset_config.py] superset | Traceback (most recent call last): superset | File "/usr/local/bin/superset", line 12, in <module> superset | from superset.cli import manager superset | File "/usr/local/lib/python3.5/dist-packages/superset/__init__.py", line 153, in <module> superset | security_manager_class=app.config.get("CUSTOM_SECURITY_MANAGER")) superset | File "/usr/local/lib/python3.5/dist-packages/flask_appbuilder/base.py", line 131, in __init__ superset | self.init_app(app, session) superset | File "/usr/local/lib/python3.5/dist-packages/flask_appbuilder/base.py", line 157, in init_app superset | self._add_admin_views() superset | File "/usr/local/lib/python3.5/dist-packages/flask_appbuilder/base.py", line 254, in _add_admin_views superset | self.sm.register_views() superset | File "/usr/local/lib/python3.5/dist-packages/flask_appbuilder/security/sqla/manager.py", line 67, in register_views superset | super(SecurityManager, self).register_views() superset | File "/usr/local/lib/python3.5/dist-packages/flask_appbuilder/security/manager.py", line 443, in register_views superset | category_label=_('Security')) superset | File "/usr/local/lib/python3.5/dist-packages/flask_appbuilder/base.py", line 345, in add_view superset | baseview = self._check_and_init(baseview) superset | File "/usr/local/lib/python3.5/dist-packages/flask_appbuilder/base.py", line 294, in _check_and_init superset | if baseview.datamodel.session is None: superset | AttributeError: 'NoneType' object has no attribute 'session' ``` #### How to reproduce the bug ### Environment - superset version: `0.20.6 or 0.28.1` - python version: `3` (coming with docker container) ### Checklist Make sure these boxes are checked before submitting your issue - thank you! - [X] I have checked the superset logs for python stacktraces and included it here as text if there are any. - [X] I have reproduced the issue with at least the latest released version of superset. - [X] I have checked the issue tracker for the same issue and I haven't found one similar.
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