Hi, with WP multisite 4.9.8 and Yoast SEO v8.0 categories are missing and only a blank page is showed and this error on logs:
PHP Fatal error: ob_start(): Cannot use output buffering in output buffering display handlers in /var/www/html/wp-content/plugins/wordpress-seo/frontend/class-frontend.php on line 1820
With Yoast disabled all are ok. I downgraded yoast to 7.9 but same result.
