marclamberti opened a new issue #12587:
URL: https://github.com/apache/airflow/issues/12587
**Apache Airflow version**: 2.0.0b3
**Kubernetes version (if you are using kubernetes)** (use `kubectl version`):
**Environment**: MacOS with Docker
- **Cloud provider or hardware configuration**:
- **OS** (e.g. from /etc/os-release):
- **Kernel** (e.g. `uname -a`):
- **Install tools**:
- **Others**:
**What happened**:
```
Traceback (most recent call last):
File "/usr/lib/python3.7/site-packages/airflow/models/taskinstance.py",
line 984, in _run_raw_task
result = task_copy.execute(context=context)
File "/usr/local/airflow/plugins/custom_trigger_operator.py", line 138, in
execute
dag_run.execution_date,
UnboundLocalError: local variable 'dag_run' referenced before assignment
```
**What you expected to happen**:
The dag_run object doesn't exist in
https://github.com/apache/airflow/blob/94ba200d42403d1067a63e2e6b158d893c2e8b5a/airflow/operators/dagrun_operator.py#L161
as the DagRunAlreadyExists exception is raised
**How to reproduce it**:
```
first_task = DummyOperator(...)
trigger_task = TriggerDagRunOperator(...
reset_dag_run=True,
wait_for_completion=True,
trigger_dag_id='my_dag_to_trigger'
...)
```
Run the DAG above once. It success. Clear the task first_task to run a
second time the DAG and so trigger again my_dag_to_trigger, you will get the
error.
**Anything else we need to know**:
Nope
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