Gravatars missing? Possible bug?

Hey everyone I’ve just registered and was wondering if I could get some help with my word-press site.

It’s been running for a few years with nothing wrong with it except the following below:

If someone visits my site as an unregistered user and posts a comment on a post/page, usually they will get a generated Gravatar next to their comment, however, there’s a problem, the gravatar is missing.

The reason is because its pointing to the following url:

****<img alt=”” src=”https://0.gravatar.com/avatar/e18122ee2ca9dc5ed02ded7e2adc1ffd?s=32&d=%3Cpath_to_url%3E&r=PG&#8221; class=”avatar avatar-32 photo” height=”32″ width=”32″>***

when going to the url it points to https://i0.wp.com/path_to_url

and says “The type of image you are trying to process is not allowed”

I think it has something to do with “Cpath_to_url” being in the gravatar url.

I’ve contacted my theme developer who’s confused about it and I’ve also searched high and low on the internet for several months only to find people talk about it and fix it with no explination.

Can anyone help?? Thanks

Chris