public function delete_meta_data_by_mid( $mid ) {
		$this->maybe_read_meta_data();
		$array_keys = array_keys( wp_list_pluck( $this->meta_data, 'id' ), (int) $mid, true );

		if ( $array_keys ) {
			foreach ( $array_keys as $array_key ) {
				$this->meta_data[ $array_key ]->value = null;
			}
		}
	}