rvg optimize database DB errors

The following errors, constant “error_log” is generating. File size is growing and swelling. Do you think the fix?

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[31-Jan-2015 15:18:35 UTC] do_action_ref_array, call_user_func_array, rvg_optimize_db_cron, rvg_get_trash, W3_Db->query, W3_DbCache->query, W3_DbCallUnderlying->query, W3_Db->query, W3_DbProcessor->query, W3_Db->default_query tarafından oluşturulan
SELECT ID AS id, ‘post’ AS post_type, post_title AS title, post_modified AS modified
FROM eb_posts
WHERE post_status = ‘trash’
UNION ALL
SELECT comment_ID AS id, ‘comment’ AS post_type, comment_author_IP AS title, comment_date AS modified
FROM eb_comments
WHERE comment_approved = ‘trash’
ORDER BY post_type, UCASE(title)
sorgusu için WordPress veritabanı hatası Illegal mix of collations for operation ‘UNION’
[31-Jan-2015 16:19:29 UTC] do_action_ref_array, call_user_func_array, rvg_optimize_db_cron, rvg_get_trash, W3_Db->query, W3_DbCache->query, W3_DbCallUnderlying->query, W3_Db->query, W3_DbProcessor->query, W3_Db->default_query tarafından oluşturulan
SELECT ID AS id, ‘post’ AS post_type, post_title AS title, post_modified AS modified
FROM eb_posts
WHERE post_status = ‘trash’
UNION ALL
SELECT comment_ID AS id, ‘comment’ AS post_type, comment_author_IP AS title, comment_date AS modified
FROM eb_comments
WHERE comment_approved = ‘trash’
ORDER BY post_type, UCASE(title)
sorgusu için WordPress veritabanı hatası Illegal mix of collations for operation ‘UNION’

https://ww.wp.xz.cn/plugins/rvg-optimize-database/