WordPressの更新で”別の更新が現在進行中です。”エラーが出るときにすべき事

SELECT * FROM wp_options WHERE option_name LIKE 'core_updater%';

DELETE FROM wp_options WHERE option_name LIKE 'core_updater%';

// Lock to prevent multiple Core Updates occurring
$lock = WP_Upgrader::create_lock( 'core_updater', 15 * MINUTE_IN_SECONDS );
if ( ! $lock ) {
    return new WP_Error( 'locked', $this->strings['locked'] );
}

/**
    * Creates a lock using WordPress options.
    *
    * @since 4.5.0
    * @access public
    * @static
    *
    * @param string $lock_name       The name of this unique lock.
    * @param int    $release_timeout Optional. The duration in seconds to respect an existing lock.
    *                                Default: 1 hour.
    * @return bool False if a lock couldn't be created or if the lock is no longer valid. True otherwise.
    */
public static function create_lock( $lock_name, $release_timeout = null ) {
    global $wpdb;
    if ( ! $release_timeout ) {
        $release_timeout = HOUR_IN_SECONDS;
    }
    $lock_option = $lock_name . '.lock';
 
    // Try to lock.
    $lock_result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` ( `option_name`, `option_value`, `autoload` ) VALUES (%s, %s, 'no') /* LOCK */", $lock_option, time() ) );
 
    if ( ! $lock_result ) {
        $lock_result = get_option( $lock_option );
 
        // If a lock couldn't be created, and there isn't a lock, bail.
        if ( ! $lock_result ) {
            return false;
        }
 
        // Check to see if the lock is still valid. If not, bail.
        if ( $lock_result > ( time() - $release_timeout ) ) {
            return false;
        }
 
        // There must exist an expired lock, clear it and re-gain it.
        WP_Upgrader::release_lock( $lock_name );
 
        return WP_Upgrader::create_lock( $lock_name, $release_timeout );
    }
 
    // Update the lock, as by this point we've definitely got a lock, just need to fire the actions.
    update_option( $lock_option, time() );
 
    return true;
}