WordPress database error Illegal mix of collations

we recently installed the newspaper theme. This is the error we are getting since we activated this:

2020/03/23 12:35:16 [error] 126664#126664: *71934795 FastCGI sent in stderr: “PHP message: WordPress database error Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8mb4_unicode_ci,COERCIBLE) for operation ‘like’ for query SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts WHERE 1=1 AND wp_posts.post_author IN (90579) AND (((wp_posts.post_title LIKE ‘%연동출장샵(까톡us5882)?제주출장업소✔%’) OR (wp_posts.post_excerpt LIKE ‘%연동출장샵(까톡us5882)?제주출장업소✔%’) OR (wp_posts.post_content LIKE ‘%연동출장샵(까톡us5882)?제주출장업소✔%’)) AND ((wp_posts.post_title LIKE ‘%서귀포op추천↘연동출장마사지%’) OR (wp_posts.post_excerpt LIKE ‘%서귀포op추천↘연동출장마사지%’) OR (wp_posts.post_content LIKE ‘%서귀포op추천↘연동출장마사지%’))) AND (wp_posts.post_password = ”) AND wp_posts.post_type IN (‘post’, ‘page’, ‘attachment’) AND (wp_posts.post_status = ‘publish’) ORDER BY (CASE WHEN wp_posts.post_title LIKE ‘%연동출장샵(까톡us5882)?제주출장업소✔ 서귀” while reading response header from upstream, client: 66.249.79.233, server: analyticsindiamag.com, request: “GET /search/%EC%97%B0%EB%8F%99%EC%B6%9C%EC%9E%A5%EC%83%B5%28%EA%B9%8C%ED%86%A1us5882%29%F0%9F%94%83%EC%A0%9C%EC%A3%BC%EC%B6%9C%EC%9E%A5%EC%97%85%EC%86%8C%E2%9C%94+%EC%84%9C%EA%B7%80%ED%8F%ACop%EC%B6%94%EC%B2%9C%E2%86%98%EC%97%B0%EB%8F%99%EC%B6%9C%EC%9E%A5%EB%A7%88%EC%82%AC%EC%A7%80/?category=3&author=90579&time=year HTTP/1.0”, upstream: “fastcgi://unix:/var/run/php7.4-fpm-analyticsindiamagazine.sock:”, host: “analyticsindiamag.com”