No Meta Description

Hello,

I’ve had this issue for a while. Although the meta description is written for pages and posts, it still shows “Document does not have a meta description” on Google PageSpeed Insights. I checked the source code and the meta description is found only in <meta property=”og:description”> but there’s no <meta name=”description”> tag. I deactivated all plugins except SlimSEO and nothing changed.

What could be causing this? How do I resolve it?