WordPress database error

I am using WordPress with Apache2.4, PHP7.0.27 and MariaDB 10.1.14.

I am seeing two errors frequently in our apache error_log

WordPress database error Table ‘wp_forum_topics’ already exists for query RENAME TABLE wp_forum_threads TO wp_forum_topics; made by require(‘wp-blog-header.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘plugins_loaded’), WP_Hook->do_action, WP_Hook->apply_filters, AsgarosForumDatabase->buildDatabase

and

WordPress database error Too many keys specified; max 64 keys allowed for query ALTER TABLE wp_forum_topics ADD FULLTEXT (name); made by require(‘wp-blog-header.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘plugins_loaded’), WP_Hook->do_action, WP_Hook->apply_filters, AsgarosForumDatabase->buildDatabase

Please advise how i resolve these errors.

Thanks
Richard