er\.com/(?P<handle>[A-Za-z0-9_]{1,25})/?$`', $twitter_id, $matches ) ) {
			return $matches['handle'];
		}

		return false;
	}

	/**
	 * Clean a given option value.
	 *
	 * @param array       $option_value          Old (not merged with defaults or filtered) option value to
	 *                                           clean according to the rules for this option.
	 * @param string|null $current_version       Optional. Version from which to upgrade, if not set,
	 *                                           version specific upgrades will be disregarded.
	 * @param array|null  $all_old_option_values Optional. Only used when importing old options to have
	 *                                           access to the real old values, in contrast to the saved ones.
	 *
	 * @return array Cleaned option.
	 */
	protected function clean_option( $option_value, $current_version = null, $all_old_option_values = null ) {

		/* Move options from very old option to this one. */
		$old_option = null;
		if ( isset( $all_old_option_values ) ) {
			// Ok, we have an import.
			if ( isset( $all_old_option_values['wpseo_indexation'] ) && is_array( $all_old_option_values['wpseo_indexation'] ) && $all_old_option_values['wpseo_indexation'] !== [] ) {
				$old_option = $all_old_option_values['wpseo_indexation'];
			}
		}
		else {
			$old_option = get_option( 'wpseo_indexation' );
		}

		if ( is_array( $old_option ) && $old_option !== [] ) {
			$move = [
				'opengraph',
			];
			foreach ( $move as $key ) {
				if ( isset( $old_option[ $key ] ) && ! isset( $option_value[ $key ] ) ) {
					$option_value[ $key ] = $old_option[ $key ];
				}
			}
			unset( $move, $key );
		}
		unset( $old_option );

		return $option_value;
	}
}
<h1>TypeError thrown</h1><p>Argument 1 passed to WPSEO_Options::register_option() must be an instance of WPSEO_Option, null given, called in /var/www/vhosts/uniteddancealmere.nl/webspace/httpdocs/uniteddancealmere.nl-wordpress/wp-content/plugins/wordpress-seo/inc/options/class-wpseo-options.php on line 63</p>