[Support request] php error

hi team,

found an error in my log-files (and not the first time):

2021/04/21 20:40:43 [error] 38987#38987: *71756 FastCGI sent in stderr: “PHP message: PHP Notice: Undefined variable: next_page_url in /www/ayahuasca_691/public/wp-content/plugins/wp-show-posts/wp-show-posts.php on line 516” while reading response header from upstream, client: 196.240.173.241, server: http://www.ayahuasca.at, request: “GET /erfahrungen/ HTTP/1.0”, upstream: “fastcgi://unix:/var/run/php7.4-fpm-ayahuasca.sock:”, host: “www.ayahuasca.at”, referrer: “https://www.ayahuasca.at”

please have a look if this is something that has to be fixed.

best