Howdy all,
The latest update to Yoast SEO will break sites running on PHP 7.0 – our default version. We’ve (hopefully) disabled updates for that plugin by changing permissions on the folder to “read-only”. As soon as we hear of a fix, we’ll change its permissions back, so it can be updated.
-TS
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It looks like WP-SEO fixed the plugin. Still, do be extra cautious updating it.
Update it by itself, not with any other plugins. And be sure to clear any caches.
-TS