Strange error

Today, i received a 500error in my try to access the backend of my wp installation.

Once i took a look at my log files, i realized that yoast was having some troubles there. I disabled it and i was able to restore my wp back to its normal state.

Error log reports this:

2015/11/19 14:26:40 [error] 30057#0: *180776 FastCGI sent in stderr: “PHP message: PHP Fatal error: Call to undefined method WPSEO_Utils::is_yoast_seo_page() in /home/gg/domains/domain.net/public_html/wp-content/plugins/wordpress-seo/admin/google_search_console/class-gsc.php on line 65” while reading response header from upstream, client: x.x.x.x, server: domain.net, request: “GET /wp-admin/ HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php5-fpm-gg.sock:”, host: “domain.net”

Let me know.

https://wordpress.org/plugins/wordpress-seo/