dstandish opened a new issue #14398:
URL: https://github.com/apache/airflow/issues/14398
**Apache Airflow version**: 2.0.1
**What happened**:
Wanted to view task instance details on webserver to verify pool definition
of tasks
Got this error
```Something bad has happened.
Please consider letting us know by creating a bug report using GitHub.
Python version: 3.7.10
Airflow version: 2.0.1
Node: pax-11009-mbp15.lan
-------------------------------------------------------------------------------
Traceback (most recent call last):
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/flask/app.py",
line 2447, in wsgi_app
response = self.full_dispatch_request()
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/flask/app.py",
line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/flask/app.py",
line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/flask/_compat.py",
line 39, in reraise
raise value
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/flask/app.py",
line 1950, in full_dispatch_request
rv = self.dispatch_request()
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/flask/app.py",
line 1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/airflow/www/auth.py",
line 34, in decorated
return func(*args, **kwargs)
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/airflow/www/decorators.py",
line 60, in wrapper
return f(*args, **kwargs)
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/airflow/www/views.py",
line 1193, in task
attr = getattr(ti, attr_name)
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/airflow/models/taskinstance.py",
line 817, in previous_start_date_success
return self.get_previous_start_date(state=State.SUCCESS)
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/airflow/utils/session.py",
line 65, in wrapper
return func(*args, session=session, **kwargs)
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/airflow/models/taskinstance.py",
line 801, in get_previous_start_date
return prev_ti and pendulum.instance(prev_ti.start_date)
File
"/Users/dstandish/.virtualenvs/pax-infra/lib/python3.7/site-packages/pendulum/__init__.py",
line 174, in instance
raise ValueError("instance() only accepts datetime objects.")
ValueError: instance() only accepts datetime objects.
```
Need to make it so that the template context is tolerant of this case
**What you expected to happen**:
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