hey all, in prefect 1, i'm expecting a

None

value as a task result with

get_task_run_result

. i'm getting this error:

Task 'get_task_run_result[17]': Exception encountered during task execution!
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/prefect/engine/task_runner.py", line 880, in get_task_run_state
    value = prefect.utilities.executors.run_task_with_timeout(
  File "/usr/local/lib/python3.9/site-packages/prefect/utilities/executors.py", line 468, in run_task_with_timeout
    return task.run(*args, **kwargs)  # type: ignore
  File "/usr/local/lib/python3.9/site-packages/prefect/tasks/prefect/flow_run.py", line 239, in get_task_run_result
    return task_run.get_result()
  File "/usr/local/lib/python3.9/site-packages/prefect/backend/task_run.py", line 75, in get_result
    self._assert_result_type_is_okay()
  File "/usr/local/lib/python3.9/site-packages/prefect/backend/task_run.py", line 162, in _assert_result_type_is_okay
    raise ValueError(
ValueError: The task result has no `location` so the result cannot be loaded. This often means that your task result has not been configured or has been configured incorrectly.

is there a way to for me to access a task's result if it's

None

? My code works when i pass an

int

Ah we don’t persist

None

results to avoid writing to files when there’s no data.

gotcha

It’s skipped at https://github.com/PrefectHQ/prefect/blob/1.x/src/prefect/engine/task_runner.py#L922

is there a way to silence/handle that error?

How are you retrieving the result of that task?

this is with the flow of flows patterns

Ah I see. That makes sense. I’d recommend just returning a different value to represent data in this case. Alternatively, you could use a utility to capture this value error when getting the result and return

None

instead.

i'll just return something else, thanks for your help here 🙂