update of packages

lisp/org/ox-publish.el

@@ -1,5 +1,5 @@
 ;;; ox-publish.el --- Publish Related Org Mode Files as a Website -*- lexical-binding: t; -*-
-;; Copyright (C) 2006-2022 Free Software Foundation, Inc.
+;; Copyright (C) 2006-2023 Free Software Foundation, Inc.
 
 ;; Author: David O'Toole <dto@gnu.org>
 ;; Maintainer: Nicolas Goaziou <mail@nicolasgoaziou.fr>
@@ -1183,7 +1183,8 @@ references with `org-export-get-reference'."
 		     (org-link-search search nil t)
 		   (error
 		    (signal 'org-link-broken (cdr err)))))
-	       (and (org-at-heading-p)
+	       (and (derived-mode-p 'org-mode)
+                    (org-at-heading-p)
 		    (org-string-nw-p (org-entry-get (point) "CUSTOM_ID"))))))))
    ((not org-publish-cache)
     (progn