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-rw-r--r--lisp/emacs-lisp/advice.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/emacs-lisp/advice.el b/lisp/emacs-lisp/advice.el
index a211e1ebba1..bc047802720 100644
--- a/lisp/emacs-lisp/advice.el
+++ b/lisp/emacs-lisp/advice.el
@@ -3005,7 +3005,7 @@ in any of these classes."
(ad-real-documentation origdef t))
(usage (help-split-fundoc origdoc function))
paragraphs advice-docstring ad-usage)
- (if usage (setq origdoc (cdr usage) usage (car usage)))
+ (setq usage (if (null usage) t (setq origdoc (cdr usage)) (car usage)))
(if origdoc (setq paragraphs (list origdoc)))
(unless (eq style 'plain)
(push (concat "This " origtype " is advised.") paragraphs))