Getting this warning when running `drush cim` in Drupal 9 ... seems this line in content_lock.module is evaluating to NULL:
$types = \Drupal::configFactory()->get('content_lock.settings')->get('types');
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install content_lock.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install datalayer.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install libraries.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install queue_ui.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install update.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install views_ui.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install admin_toolbar_search.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install feeds.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install feeds_ex.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install tamper.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install feeds_tamper.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install migrate_source_csv.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install migrate_source_ui.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install remote_stream_wrapper.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install d8unsw_cs.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install d8unsw_cs_utilities.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install d8unsw_cs_buildings_rooms.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install d8unsw_cs_events.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install d8unsw_cs_newsroom_news.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238
[notice] Synchronized extensions: install d8unsw_cs_resgate_utilities.
[warning] array_filter() expects parameter 1 to be array, null given content_lock.module:238
[warning] Invalid argument supplied for foreach() content_lock.module:238