gistfile1.py

AttributeError: 'NoneType' object has no attribute 'parent_run_id'
  File "/opt/bitnami/python/lib/python3.7/site-packages/dagster/core/execution/plan/execute_plan.py", line 193, in _dagster_event_sequence_for_step
    for step_event in check.generator(step_events):
  File "/opt/bitnami/python/lib/python3.7/site-packages/dagster/core/execution/plan/execute_step.py", line 283, in core_dagster_event_sequence_for_step
    input_lineage.extend(step_input.source.get_asset_lineage(step_context))
  File "/opt/bitnami/python/lib/python3.7/site-packages/dagster/core/execution/plan/inputs.py", line 285, in get_asset_lineage
    load_context = self.get_load_context(step_context)
  File "/opt/bitnami/python/lib/python3.7/site-packages/dagster/core/execution/plan/inputs.py", line 231, in get_load_context
    resources,
  File "/opt/bitnami/python/lib/python3.7/site-packages/dagster/core/execution/context/system.py", line 447, in for_input_manager
    upstream_output=self.get_output_context(source_handle) if source_handle else None,
  File "/opt/bitnami/python/lib/python3.7/site-packages/dagster/core/execution/context/system.py", line 425, in get_output_context
    self._get_source_run_id(step_output_handle),
  File "/opt/bitnami/python/lib/python3.7/site-packages/dagster/core/execution/context/system.py", line 501, in _get_source_run_id
    return self._get_source_run_id_from_logs(step_output_handle)
  File "/opt/bitnami/python/lib/python3.7/site-packages/dagster/core/execution/context/system.py", line 465, in _get_source_run_id_from_logs
    run_id_to_parent_run_id = {run.run_id: run.parent_run_id for run in runs}
  File "/opt/bitnami/python/lib/python3.7/site-packages/dagster/core/execution/context/system.py", line 465, in <dictcomp>
    run_id_to_parent_run_id = {run.run_id: run.parent_run_id for run in runs}