Task_id must not be empty. Got None instead

My celery bars work fine normally, but when I try use it inside of a threadpool executor function, it fails. I pass the self keyword. Inside the threaded function, whenever I set the progress bar as:

`progress_recorder.set_progress(8, seconds)`

I get an error message:

`Task_id must not be empty. Got None instead`

on that line.

Any help would be appreciated!