esc_html__( 'The default blog setting must be the numeric blog id of the blog you want to use as default.', 'wordpress-seo' )
										. '<br>'
										. sprintf(
											/* translators: %s is the ID number of a blog. */
											esc_html__( 'This must be an existing blog. Blog %s does not exist or has been marked as deleted.', 'wordpress-seo' ),
											'<strong>' . esc_html( sanitize_text_field( $dirty[ $key ] ) ) . '</strong>'
										), // The error message.
									'error' // Message type.
								);
							}
							unset( $exists );
						}
						elseif ( function_exists( 'add_settings_error' ) ) {
							add_settings_error(
								$this->group_name, // Slug title of the setting.
								$key, // Suffix-ID for the error message box.
								esc_html__( 'The default blog setting must be the numeric blog id of the blog you want to use as default.', 'wordpress-seo' ) . '<br>' . esc_html__( 'No numeric value was received.', 'wordpress-seo' ), // The error message.
								'error' // Message type.
							);
						}
						unset( $int );
					}
					break;

				default:
					$clean[ $key ] = ( isset( $dirty[ $key ] ) ? WPSEO_Utils::validate_bool( $dirty[ $key ] ) : false );
					break;
			}
		}

		return $clean;
	}
}