darwinyip opened a new issue #9571:
URL: https://github.com/apache/airflow/issues/9571
**Apache Airflow version**: 1.10.10
**Environment**:
- **Cloud provider or hardware configuration**: aws
- **OS** (e.g. from /etc/os-release): ecs task
- **Kernel** (e.g. `uname -a`): python 3.6 image
**What happened**:
Upgrading from 1.10.9 to 1.10.10 gave error when trying to access UI
```
Node: 8cec32b7a064
-------------------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 2447, in
wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1952, in
full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1821, in
handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 39,
in reraise
raise value
File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1950, in
full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1936, in
dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/usr/local/lib/python3.6/site-packages/flask_admin/base.py", line
69, in inner
return self._run_view(f, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/flask_admin/base.py", line
368, in _run_view
return fn(self, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/flask_login/utils.py", line
258, in decorated_view
return func(*args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/airflow/utils/db.py", line
74, in wrapper
return func(*args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/airflow/www/views.py", line
2330, in index
auto_complete_data=auto_complete_data)
File "/usr/local/lib/python3.6/site-packages/airflow/www/views.py", line
389, in render
return super(AirflowViewMixin, self).render(template, **kwargs)
File "/usr/local/lib/python3.6/site-packages/flask_admin/base.py", line
308, in render
return render_template(template, **kwargs)
File "/usr/local/lib/python3.6/site-packages/flask/templating.py", line
140, in render_template
ctx.app,
File "/usr/local/lib/python3.6/site-packages/flask/templating.py", line
120, in _render
rv = template.render(context)
File "/usr/local/lib/python3.6/site-packages/jinja2/asyncsupport.py", line
76, in render
return original_render(self, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/jinja2/environment.py", line
1008, in render
return self.environment.handle_exception(exc_info, True)
File "/usr/local/lib/python3.6/site-packages/jinja2/environment.py", line
780, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.6/site-packages/jinja2/_compat.py", line 37,
in reraise
raise value.with_traceback(tb)
File
"/usr/local/lib/python3.6/site-packages/airflow/www/templates/airflow/dags.html",
line 20, in top-level template code
{% extends "airflow/master.html" %}
File
"/usr/local/lib/python3.6/site-packages/airflow/www/templates/airflow/master.html",
line 20, in top-level template code
{% extends "admin/master.html" %}
File
"/usr/local/lib/python3.6/site-packages/airflow/www/templates/admin/master.html",
line 20, in top-level template code
{% extends 'admin/base.html' %}
File
"/usr/local/lib/python3.6/site-packages/flask_admin/templates/bootstrap3/admin/base.html",
line 38, in top-level template code
{% block page_body %}
File
"/usr/local/lib/python3.6/site-packages/airflow/www/templates/admin/master.html",
line 191, in block "page_body"
{% block body %}
File
"/usr/local/lib/python3.6/site-packages/airflow/www/templates/airflow/dags.html",
line 84, in block "body"
<a href="{{ url_for('airflow.'+ dag.get_default_view(),
dag_id=dag.dag_id) }}" title="{{ dag.description[0:80] + '...' if
dag.description|length > 80 else dag.description }}">
TypeError: object of type 'NoneType' has no len()
```
**What you expected to happen**:
See UI
**How to reproduce it**:
Upgrade airflow
`airflow upgradedb`
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