fresh awx 6.1.0 or 7.0.0 fails on kubernetes

i’m trying to deploy a new installation of awx since i wasn’t able to upgrade from 6.0.0 to 6.1.0
6.1.0 and 7.0.0 both fails at
TASK [kubernetes : create django super user if it does not exist]

with the following error:

Traceback (most recent call last):
File "/usr/bin/awx-manage", line 11, in <module>     load_entry_point('awx==7.0.0.0', 'console_scripts', 'awx-manage')()
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/awx/__init__.py", line 142, in manage     execute_from_command_line(sys.argv)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line     utility.execute()
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/core/management/__init__.py", line 375, in execute     self.fetch_command(subcommand).run_from_argv(self.argv)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/core/management/base.py", line 323, in run_from_argv     self.execute(*args, **cmd_options)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/core/management/base.py", line 364, in execute     output = self.handle(*args, **options)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/core/management/commands/shell.py", line 92, in handle     exec(sys.stdin.read())
File "<string>", line 1, in <module>
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/contrib/auth/models.py", line 162, in create_superuser     return self._create_user(username, email, password, **extra_fields)   File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/contrib/auth/models.py", line 145, in _create_user     user.save(using=self._db
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/contrib/auth/base_user.py", line 66, in save     super().save(*args, **kwargs)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/models/base.py", line 741, in save     force_update=force_update, update_fields=update_fields)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/models/base.py", line 779, in save_base     force_update, using, update_fields,
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/models/base.py", line 870, in _save_table     result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/models/base.py", line 908, in _do_insert     using=using, raw=raw)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/models/manager.py", line 82, in manager_method     return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/models/query.py", line 1186, in _insert     return query.get_compiler(using=using).execute_sql(return_id)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/models/sql/compiler.py", line 1335, in execute_sql     cursor.execute(sql, params)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/backends/utils.py", line 67, in execute     return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/backends/utils.py", line 76, in _execute_with_wrappers     return executor(sql, params, many, context)   File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute     return self.cursor.execute(sql, params)
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/utils.py", line 89, in __exit__     raise dj_exc_value.with_traceback(traceback) from exc_value
File "/var/lib/awx/venv/awx/lib64/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute     return self.cursor.execute(sql, params) django.db.utils.IntegrityError: null value in column "last_login" violates not-null constraint DETAIL:  Failing row contains (1, <redacted>..., null, t, admin, , , root@localhost, t, t, 2019-09-05 14:25:39.785032+00)

I deployed 5.0.0 and 6.0.0 successfully

Devel is failing too.
So all version from 6.10 on are failing for me

Any tips?
Thanks

FYI the problem resides with python version installed on the worker nodes in kubernetes.
Mine were running python 3.5, so tried to upgrade to python 3.6 and magically everything started working.
But i’m wondering why awx containers do care about the python version installed on the workers.