Session does not live the entire session, error aiohttp_session[secure] - Cannot decrypt cookie value, create a new fresh session?

Question

Python

I can’t understand the essence of the problem, more precisely, how to defeat Cannot decrypt cookie value, create a new fresh session.
There is a layer
Example

@web.middleware
async def auth_session(request, handler):
    session = await get_session(request)
    session_key = session.get('session_key')
    if session_key:
        async with request.app['db'].acquire() as conn:
            result = await conn.execute(sa.select([Session]).where(session_key == session_key))
            session_inst = await result.fetchone()
            if session_inst:
                await conn.execute(Session.update().values(
                    modified_at=datetime.datetime.now()
                ).where(
                    Session.c.session_key == session_key
                ))
                await conn.execute('commit')
    else:
        session_key = generate_session_key()
        session['session_key'] = session_key
        async with request.app['db'].acquire() as conn:
            await conn.execute(Session.insert().values(session_key=session_key, data={}))
            await conn.execute('commit')

    response = await handler(request)
    return response

Пример инициализации приложения
loop = asyncio.get_event_loop()
    app = web.Application(loop=loop, debug=True)
    
    fernet_key = fernet.Fernet.generate_key()
    secret_key = base64.urlsafe_b64decode(fernet_key)
    
    setup(app, EncryptedCookieStorage(secret_key, httponly=True, max_age=60 * 60 * 24 * 5))

I go to the page, update, stupidly click and update, and then there is an error, Cannot decrypt cookie value, create a new fresh session, the session is regenerated, help me sort out the problem. Thank you.