Warning: Undefined array key "name" in Drupal\language\Plugin\Derivative\LanguageBlock->getDerivativeDefinitions()

Problem/Motivation

When I do a cache rebuild I get an error called:
Warning: Undefined array key "name" in Drupal\language\Plugin\Derivative\LanguageBlock->getDerivativeDefinitions() (line 27 of /var/core/drupal/www/core/modules/language/src/Plugin/Derivative/LanguageBlock.php).

Proposed resolution

Provide a fix for the following code line:
$this->derivatives[$type]['admin_label'] = $this->t('Language switcher (@type)', ['@type' => $info[$type]['name']]);