Fatal error: Uncaught Error: Call to a member function get_avatar_url()

We just received an email from one of our readers that the “unsubscribe” link in the email returns an error (we use a plugin called “Subscribe To Comments Reloaded” to allow users to subscribe to comments).

I checked it on my end, and indeed, the link returns a fatal error. Looks like there’s some incompatibility with one of the components of Rank Math SEO.

The page I need help with: [log in to see the link]