Plugin links posts to self

I know I’m not the first person to point out that this plugin causes custom keyword post links to link posts to themselves (i.e. the link in a post directs people to the post they are already on), even if you choose the option that is supposed to prevent this from happening. I saw a post with instructions by Chris that show how to fix this problem, but his fix isn’t working for me. His instructions are over two years old and I suspect that the code has been modified in such a way that his fix is no longer valid.

Does anyone know how to fix this problem? I don’t mind having to edit the code but I’m not a coder so have no idea how to do this myself.

https://www.ads-software.com/plugins/seo-automatic-links/