GitHub user jlandercy created a discussion: Cannot upgrade Airflow 3.1.0 to
3.1.7, session seems to be empty
I would like to upgrade my Airflow instances to the latest version of Airflow
3.1.7.
But when I build the new image, everything starts but the API fails with the
following error:
```
[2026-03-01T09:48:38.180881Z] {_utils.py:59} ERROR - Exception when querying
database (MessagePack data is malformed: trailing characters (byte 1)).Retrying
(1/3) in 0.30s.
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_session/_utils.py",
line 52, in wrapper
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_session/sqlalchemy/sqlalchemy.py",
line 152, in _retrieve_session_data
return self.serializer.decode(serialized_session_data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/www/session.py",
line 35, in loads
return decoder.decode(data)
^^^^^^^^^^^^^^^^^^^^
msgspec.DecodeError: MessagePack data is malformed: trailing characters (byte 1)
[2026-03-01T09:48:38.483113Z] {_utils.py:59} ERROR - Exception when querying
database (MessagePack data is malformed: trailing characters (byte 1)).Retrying
(2/3) in 0.60s.
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_session/_utils.py",
line 52, in wrapper
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_session/sqlalchemy/sqlalchemy.py",
line 152, in _retrieve_session_data
return self.serializer.decode(serialized_session_data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/www/session.py",
line 35, in loads
return decoder.decode(data)
^^^^^^^^^^^^^^^^^^^^
msgspec.DecodeError: MessagePack data is malformed: trailing characters (byte 1)
[2026-03-01T09:48:39.085030Z] {app.py:1744} ERROR - Exception on /login/ [GET]
Traceback (most recent call last):
File "/home/airflow/.local/lib/python3.12/site-packages/flask/app.py", line
2528, in wsgi_app
ctx.push()
File "/home/airflow/.local/lib/python3.12/site-packages/flask/ctx.py", line
375, in push
self.session = session_interface.open_session(self.app, self.request)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_session/base.py", line
350, in open_session
saved_session_data = self._retrieve_session_data(store_id)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_session/_utils.py",
line 56, in wrapper
raise e
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_session/_utils.py",
line 52, in wrapper
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_session/sqlalchemy/sqlalchemy.py",
line 152, in _retrieve_session_data
return self.serializer.decode(serialized_session_data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/www/session.py",
line 35, in loads
return decoder.decode(data)
^^^^^^^^^^^^^^^^^^^^
msgspec.DecodeError: MessagePack data is malformed: trailing characters (byte 1)
INFO: 172.18.0.4:58526 - "GET /auth/login/?next=https://app.landercy.be/
HTTP/1.1" 500 Internal Server Error
ERROR: Exception in ASGI application
+ Exception Group Traceback (most recent call last):
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/_utils.py", line
79, in collapse_excgroups
| yield
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/base.py",
line 183, in __call__
| async with anyio.create_task_group() as task_group:
| ^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py",
line 783, in __aexit__
| raise BaseExceptionGroup(
| ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Exception Group Traceback (most recent call last):
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/base.py",
line 184, in __call__
| response = await self.dispatch_func(request, call_next)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/auth_manager/fab_auth_manager.py",
line 237, in cleanup_session_middleware
| response = await call_next(request)
| ^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/base.py",
line 159, in call_next
| raise app_exc
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/base.py",
line 144, in coro
| await self.app(scope, receive_or_disconnect, send_no_error)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/exceptions.py",
line 63, in __call__
| await wrap_app_handling_exceptions(self.app, conn)(scope, receive,
send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/_exception_handler.py",
line 53, in wrapped_app
| raise exc
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/_exception_handler.py",
line 42, in wrapped_app
| await app(scope, receive, sender)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line
716, in __call__
| await self.middleware_stack(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line
736, in app
| await route.handle(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line
462, in handle
| await self.app(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/wsgi.py",
line 81, in __call__
| await responder(receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/wsgi.py",
line 106, in __call__
| async with anyio.create_task_group() as task_group:
| ^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py",
line 783, in __aexit__
| raise BaseExceptionGroup(
| ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File
"/home/airflow/.local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py",
line 416, in run_asgi
| result = await app( # type: ignore[func-returns-value]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py",
line 1082, in __call__
| await super().__call__(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/applications.py",
line 113, in __call__
| await self.middleware_stack(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/errors.py",
line 186, in __call__
| raise exc
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/errors.py",
line 164, in __call__
| await self.app(scope, receive, _send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/gzip.py",
line 29, in __call__
| await responder(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/gzip.py",
line 130, in __call__
| await super().__call__(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/gzip.py",
line 46, in __call__
| await self.app(scope, receive, self.send_with_compression)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/cors.py",
line 85, in __call__
| await self.app(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/base.py",
line 189, in __call__
| raise app_exc
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/base.py",
line 144, in coro
| await self.app(scope, receive_or_disconnect, send_no_error)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/exceptions.py",
line 63, in __call__
| await wrap_app_handling_exceptions(self.app, conn)(scope, receive,
send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/_exception_handler.py",
line 53, in wrapped_app
| raise exc
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/_exception_handler.py",
line 42, in wrapped_app
| await app(scope, receive, sender)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line
716, in __call__
| await self.middleware_stack(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line
736, in app
| await route.handle(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line
462, in handle
| await self.app(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py",
line 1082, in __call__
| await super().__call__(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/applications.py",
line 113, in __call__
| await self.middleware_stack(scope, receive, send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/errors.py",
line 186, in __call__
| raise exc
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/errors.py",
line 164, in __call__
| await self.app(scope, receive, _send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/base.py",
line 182, in __call__
| with recv_stream, send_stream, collapse_excgroups():
| ^^^^^^^^^^^^^^^^^^^^
| File "/usr/python/lib/python3.12/contextlib.py", line 158, in __exit__
| self.gen.throw(value)
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/_utils.py", line
85, in collapse_excgroups
| raise exc
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/wsgi.py",
line 109, in __call__
| await anyio.to_thread.run_sync(self.wsgi, environ,
self.start_response)
| File
"/home/airflow/.local/lib/python3.12/site-packages/anyio/to_thread.py", line
63, in run_sync
| return await get_async_backend().run_sync_in_worker_thread(
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py",
line 2502, in run_sync_in_worker_thread
| return await future
| ^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py",
line 986, in run
| result = context.run(func, *args)
| ^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/wsgi.py",
line 147, in wsgi
| for chunk in self.app(environ, start_response):
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/flask/app.py", line 2552, in
__call__
| return self.wsgi_app(environ, start_response)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/flask/app.py", line 2532, in
wsgi_app
| response = self.handle_exception(e)
| ^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/flask/app.py", line 1727, in
handle_exception
| server_error = self.ensure_sync(handler)(server_error)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/www/views.py",
line 75, in show_traceback
| return render_template("airflow/traceback.html"), 500
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/flask/templating.py", line
147, in render_template
| return _render(app, template, context)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/flask/templating.py", line
128, in _render
| app.update_template_context(context)
| File
"/home/airflow/.local/lib/python3.12/site-packages/flask/app.py", line 997, in
update_template_context
| context.update(func())
| ^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/flask_login/utils.py", line
405, in _user_context_processor
| return dict(current_user=_get_user())
| ^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/flask_login/utils.py", line
370, in _get_user
| current_app.login_manager._load_user()
| File
"/home/airflow/.local/lib/python3.12/site-packages/flask_login/login_manager.py",
line 362, in _load_user
| user_id = session.get("_user_id")
| ^^^^^^^^^^^
| AttributeError: 'NoneType' object has no attribute 'get'
+------------------------------------
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py",
line 416, in run_asgi
result = await app( # type: ignore[func-returns-value]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py",
line 1082, in __call__
await super().__call__(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/applications.py",
line 113, in __call__
await self.middleware_stack(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/errors.py",
line 186, in __call__
raise exc
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/errors.py",
line 164, in __call__
await self.app(scope, receive, _send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/gzip.py",
line 29, in __call__
await responder(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/gzip.py",
line 130, in __call__
await super().__call__(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/gzip.py",
line 46, in __call__
await self.app(scope, receive, self.send_with_compression)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/cors.py",
line 85, in __call__
await self.app(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/base.py",
line 189, in __call__
raise app_exc
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/base.py",
line 144, in coro
await self.app(scope, receive_or_disconnect, send_no_error)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/exceptions.py",
line 63, in __call__
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/_exception_handler.py",
line 53, in wrapped_app
raise exc
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/_exception_handler.py",
line 42, in wrapped_app
await app(scope, receive, sender)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line
716, in __call__
await self.middleware_stack(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line
736, in app
await route.handle(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line
462, in handle
await self.app(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py",
line 1082, in __call__
await super().__call__(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/applications.py",
line 113, in __call__
await self.middleware_stack(scope, receive, send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/errors.py",
line 186, in __call__
raise exc
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/errors.py",
line 164, in __call__
await self.app(scope, receive, _send)
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/base.py",
line 182, in __call__
with recv_stream, send_stream, collapse_excgroups():
^^^^^^^^^^^^^^^^^^^^
File "/usr/python/lib/python3.12/contextlib.py", line 158, in __exit__
self.gen.throw(value)
File "/home/airflow/.local/lib/python3.12/site-packages/starlette/_utils.py",
line 85, in collapse_excgroups
raise exc
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/wsgi.py",
line 109, in __call__
await anyio.to_thread.run_sync(self.wsgi, environ, self.start_response)
File "/home/airflow/.local/lib/python3.12/site-packages/anyio/to_thread.py",
line 63, in run_sync
return await get_async_backend().run_sync_in_worker_thread(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py",
line 2502, in run_sync_in_worker_thread
return await future
^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py",
line 986, in run
result = context.run(func, *args)
^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/wsgi.py",
line 147, in wsgi
for chunk in self.app(environ, start_response):
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/airflow/.local/lib/python3.12/site-packages/flask/app.py", line
2552, in __call__
return self.wsgi_app(environ, start_response)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/airflow/.local/lib/python3.12/site-packages/flask/app.py", line
2532, in wsgi_app
response = self.handle_exception(e)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/airflow/.local/lib/python3.12/site-packages/flask/app.py", line
1727, in handle_exception
server_error = self.ensure_sync(handler)(server_error)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/www/views.py",
line 75, in show_traceback
return render_template("airflow/traceback.html"), 500
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/airflow/.local/lib/python3.12/site-packages/flask/templating.py",
line 147, in render_template
return _render(app, template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/airflow/.local/lib/python3.12/site-packages/flask/templating.py",
line 128, in _render
app.update_template_context(context)
File "/home/airflow/.local/lib/python3.12/site-packages/flask/app.py", line
997, in update_template_context
context.update(func())
^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_login/utils.py", line
405, in _user_context_processor
return dict(current_user=_get_user())
^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_login/utils.py", line
370, in _get_user
current_app.login_manager._load_user()
File
"/home/airflow/.local/lib/python3.12/site-packages/flask_login/login_manager.py",
line 362, in _load_user
user_id = session.get("_user_id")
^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'get'
```
It seems the session for the user does not exist and return None. My
dependencies are up-to-date:
```
apache-airflow==3.1.7
apache-airflow-core==3.1.7
apache-airflow-providers-fab==3.3.0
apache-airflow-providers-common-compat>=1.7.4
apache-airflow-providers-common-io>=1.6.3
apache-airflow-providers-common-sql>=1.28.1
apache-airflow-providers-papermill>=3.11.3
apache-airflow-providers-postgres>=6.3.0
apache-airflow-providers-smtp>=2.3.1
apache-airflow-providers-standard>=1.9.0
apache-airflow-task-sdk>=1.1.2
```
I have done several research on the internet but it does not help for this
specific error. I am wondering what am I doing wrong?
Any help is appreciated. Thank you further.
Jean
GitHub link: https://github.com/apache/airflow/discussions/62663
----
This is an automatically sent email for [email protected].
To unsubscribe, please send an email to: [email protected]
