badlink emails

Hello,

I’m constantly receiving emails similar to this one;

A user tried to go to https://littlepieceofpie.com/2011/12/08/reindeer-cookies/#comment-839 and received a 404 (page not found) error. It wasn’t their fault, so try fixing it.
They came from https://littlepieceofpie.com/2011/12/08/reindeer-cookies/

and this one…

A user tried to go to https://littlepieceofpie.com/category/a-little-making/a%20little%20making and received a 404 (page not found) error. It wasn’t their fault, so try fixing it.
They came from https://littlepieceofpie.com/category/a-little-making/

Though when I go to the link it seems to work for me.

Is it a genuine error that I need to fix (and how would I do that?)

thanks