atrbgithub opened a new issue, #28002:
URL: https://github.com/apache/airflow/issues/28002
### Apache Airflow version
main (development)
### What happened
Create a simple dag, allow it to completely run through.
Next, when in grid view, on the left hand side click on the dag run at the
top level.
On the right hand side, then click on "Clear existing tasks". This will
error with the following on the web server:
```
[2022-11-29 17:55:05,939] {app.py:1742} ERROR - Exception on /dagrun_clear
[POST]
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2525, in
wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1822, in
full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1820, in
full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1796, in
dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
File "/opt/airflow/airflow/www/auth.py", line 47, in decorated
return func(*args, **kwargs)
File "/opt/airflow/airflow/www/decorators.py", line 83, in wrapper
return f(*args, **kwargs)
File "/opt/airflow/airflow/www/views.py", line 2184, in dagrun_clear
confirmed=confirmed,
File "/opt/airflow/airflow/www/views.py", line 2046, in _clear_dag_tis
session=session,
File "/opt/airflow/airflow/utils/session.py", line 72, in wrapper
return func(*args, **kwargs)
File "/opt/airflow/airflow/models/dag.py", line 2030, in clear
exclude_task_ids=exclude_task_ids,
File "/opt/airflow/airflow/models/dag.py", line 1619, in
_get_task_instances
tis = session.query(TaskInstance)
AttributeError: 'NoneType' object has no attribute 'query'
```
https://github.com/apache/airflow/blob/527fbce462429fc9836837378f801eed4e9d194f/airflow/models/dag.py#L1619
As per issue title, fails on main branch and `2.5.0rc2`. Works fine on
`2.3.3` and `2.4.3`.
### What you think should happen instead
Tasks within the dag should be cleared as expected.
### How to reproduce
Run a dag, attempt to clear it within the UI at the top level of the dag.
### Operating System
Ran via breeze
### Versions of Apache Airflow Providers
N/A
### Deployment
Other 3rd-party Helm chart
### Deployment details
Tested via breeze.
### Anything else
Happens every time.
### Are you willing to submit PR?
- [X] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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