WordPress database error

Hi,

After the recent plugin update to version 2.1, I constantly get the following error message:

WordPress database error: [Illegal argument to a regular expression.]
SELECT wp_posts.ID FROM wp_posts INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) WHERE 1=1 AND ( ( wp_postmeta.meta_key = ‘chart-categories’ AND wp_postmeta.meta_value RLIKE ‘[[:<:]]19[[:>:]]’ ) ) AND wp_posts.post_type = ‘size-chart’ AND ((wp_posts.post_status = ‘publish’)) GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC LIMIT 0, 1

I’m using PHP 7.3.5, and MySQL 8.0.16 in my environment. I would appreciate it if you could provide a solution to this problem, or fix it in the following updates.

Thanks in advance.