undefined url in logs

Hi,

Thanks for the great plugin. I have been using it for a while, everything looks great until when I see a lot of urls with the “undefined” at the end in the logs. For example, one of the post url is https://abc.com/love, in the log it shows https://abc.com/love/undefined. I am not aware of where/how an user would type or click this link. I was able to solve it by using a regex redirect. But I’m wondering what’s the root cause of this issue. Do you have any clues on why there are so many attempts to open urls ending with undefined?

Thank you!
Larry