sorry database.class.php not backup-scheduler.php
It seems that slbackup generates NULL for some types.
In fact, it expects that get_col_info returns a string for type like ‘string’, ‘blob’, ‘datetime’ but with the mysqli driver it returns a constant like 252, 253… according to this page : http://www.php.net/manual/en/mysqli.constants.php
look into the file backup-scheduler.php : $wpdb->get_col_info(‘type’, $ii) == “string”
