Fatal error: Call to a member function getFormLanguage() on a non-object

The call to entity_language($entity_type, $entity) on a hook_field_access() throws fatal errors for some fields. This occurs because the call $langcode = $handler->getFormLanguage(); is not securely wrapped for avoid non object method calls.

// This function leaves on entity_translation.module
function entity_translation_language($entity_type, $entity) {
  $handler = entity_translation_get_handler($entity_type, $entity);
  $langcode = $handler->getFormLanguage();
  return !empty($langcode) ? $langcode : $handler->getLanguage();
}

The following changes avoid this problem.

// This function leaves on entity_translation.module
function entity_translation_language($entity_type, $entity) {
  $handler = entity_translation_get_handler($entity_type, $entity);
  if (empty($handler)) {
    return LANGUAGE_NONE;
  }
  $langcode = $handler->getFormLanguage();
  return !empty($langcode) ? $langcode : $handler->getLanguage();
}