Unlink for buffer throws an exception

[abcdw]

It seems the problem is that propertize doesn't handle non-string values.

Debugger entered--Lisp error: (wrong-type-argument stringp #<buffer tmp.scm<tmp>>)
  propertize(#<buffer tmp.scm<tmp>> face bold)
  sesman--format-link(((Arei . "guile-ares-rs:localhost:7888") buffer #<buffer tmp.scm<tmp>>))
  #f(compiled-function (link) #<bytecode 0x18e0c2b0d7d24b9c>)(((Arei . "guile-ares-rs:localhost:7888") buffer #<buffer tmp.scm<tmp>>))
  mapcar(#f(compiled-function (link) #<bytecode 0x18e0c2b0d7d24b9c>) (((Arei . "guile-ares-rs:localhost:7888") buffer #<buffer tmp.scm<tmp>>)))
  sesman--ask-for-link("Unlink: " (((Arei . "guile-ares-rs:localhost:7888") buffer #<buffer tmp.scm<tmp>>)) ask-all)
  sesman-unlink()
  funcall-interactively(sesman-unlink)
  command-execute(sesman-unlink record)
  execute-extended-command(nil "sesman-unlink" nil)
  funcall-interactively(execute-extended-command nil "sesman-unlink" nil)
  command-execute(execute-extended-command)

A temporary workaround:

(defun arei--sesman--format-link (link)
  "Like original `sesman--format-link', but wraps values into format
to ensure that they are string and propertize can handle them."
  (let* ((system (sesman--lnk-system-name link))
         (session (gethash (car link) sesman-sessions-hashmap)))
    (format "%s(%s) -> %s [%s]"
            (sesman--lnk-context-type link)
            (propertize
             (format "%s" (sesman--abbrev-path-maybe (sesman--lnk-value link)))
             'face 'bold)
            (propertize
             (format "%s" (sesman--lnk-session-name link))
             'face 'bold)
            (if session
                (sesman--format-session-objects system session)
              "invalid"))))

(advice-add 'sesman--format-link :override 'arei--sesman--format-link)