Author Avatar Broken

Hello!

Thank you for this plugin, it’s fantastic. It works almost perfectly, but when validating the AMP pages, I get the following error:

Failed to load resource: the server responded with a status of 400 (Bad Request)
cdn.ampproject.org/v0.js:77 Failed HTTP request for  <img amp-img-id=​"AMP_2" class=​"-amp-fill-content -amp-replaced-content -amp-error" width=​"24" height=​"24" src=​"http:​/​/​0.gravatar.com/​avatar/​c027b69d58ba3bdaff9691dacfe3b0d3?s=24&d=wp_user_avatar&r=g">​ .bc @ cdn.ampproject.org/v0.js:77
cdn.ampproject.org/v0.js:3 Uncaught (in promise) Error: Failed HTTP request for img. _reported_
    at Error (native)
    at Object.l.assert (https://cdn.ampproject.org/v0.js:3:702)
    at https://cdn.ampproject.org/v0.js:107:370
    at HTMLImageElement.e (https://cdn.ampproject.org/v0.js:106:374)

The author image is broken for every author. Is there a way of either fixing this, or just removing the author image?

We don’t use Gravatar images, we use the plugin WP User Avatar if that helps at all.

https://wordpress.org/plugins/amp/