Error when saving a new field without an association
TypeError: Illegal offset type in Drupal\Core\Entity\EntityStorageBase->load(target_id)
Because the target id is a array, add check if it isn't array for get the entity block
if(!is_array($value['target_id'])) {
$entity = \Drupal::entityTypeManager()->getStorage($entity_type)->load($value['target_id']);
// Add the current revision ID.
$values[$key]['target_revision_id'] = $entity->getRevisionId();
}
Postponed: needs info
1.10
Code
This is probably a duplicate of 🐛 Entity Reference Revisions Select List Widget doesn't save Needs work .