Using buffer-name causes potential errors

[terlar]

buffer-name does not always return the actual file-name. If you have multiple buffers with the same conflicting name it could be renamed, as well as personally I have custom code displaying different buffer-name based on project.

E.g.

(defun +projectile-relative-buf-name ()
  (when (buffer-file-name)
    (let ((buffer-name (if (projectile-project-p)
                           (concat (projectile-project-name) "/" (file-relative-name (buffer-file-name) (projectile-project-root)))
                         (abbreviate-file-name (buffer-file-name)))))
      (rename-buffer buffer-name t))))
(add-hook 'find-file-hook #'+projectile-relative-buf-name)

In those cases you will get, since the buffer-name is passed as --stdin-filename:

Error: ENOENT: no such file or directory, scandir '/path/to/src/code'

One work-around is to instead use buffer-file-name which will give the absolute path to the file.