x-session-previous-id not defined

[Tak Ota]

When starting 21.2.50, without having something like this I get an
error saying that Symbol's value as variable is void:
x-session-previous-id

-Tak

*** startup.el.orig     Tue Mar 10 08:54:40 2002
--- startup.el  Tue Mar 12 07:52:17 2002
***************
*** 1033,1039 ****
  
    ;; Run emacs-session-restore (session management) if started by
    ;; the session manager and we have a session manager connection.
!   (if (and (stringp x-session-previous-id) (stringp x-session-id))
        (emacs-session-restore)))
  
  (defcustom initial-scratch-message (purecopy "\
--- 1033,1040 ----
  
    ;; Run emacs-session-restore (session management) if started by
    ;; the session manager and we have a session manager connection.
!   (if (and (boundp 'x-session-previous-id) (stringp x-session-previous-id)
!          (boundp x-session-id) (stringp x-session-id))
        (emacs-session-restore)))
  
  (defcustom initial-scratch-message (purecopy "\