Error in php log

  • Hello.

    I got this error in the php log on my localhost (WAMP64).

    Any suggestions? I didn’t see it on my live site, but not certain if its an issue.

    WordPress database error Illegal mix of collations (utf8mb4_0900_ai_ci,IMPLICIT) and (utf8mb4_unicode_520_ci,IMPLICIT) for operation '=' for query DELETE FROM comment_notifier WHERE email NOT IN ( SELECT comment_author_email FROM comments ) made by activate_plugin, do_action('activate_comment-notifier-no-spammers/comment-notifier-no-spammers.php'), WP_Hook->do_action, WP_Hook->apply_filters, lstc_activate, lstc_cleanup_prior

    Thank you so much!

    PS the plugin seems to be working flawlessly on live site.

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