Notice: Undefined index: bef when BEF is enabled while a view is being edited

Kind of a strange use case: If you enable BEF while you have a view open for editing and then try to set BEF for the exposed form it raises the following PHP notice:

Notice: Undefined index: bef in Drupal\better_exposed_filters\Plugin\views\exposed_form\BetterExposedFilters->getSettings() (line 1481 of ...\docroot\modules\better_exposed_filters\src\Plugin\views\exposed_form\BetterExposedFilters.php).