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-rw-r--r--lisp/emacs-lisp/cl-lib.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/emacs-lisp/cl-lib.el b/lisp/emacs-lisp/cl-lib.el
index c183852fd3b..6ac08d839b1 100644
--- a/lisp/emacs-lisp/cl-lib.el
+++ b/lisp/emacs-lisp/cl-lib.el
@@ -631,7 +631,7 @@ If ALIST is non-nil, the new pairs are prepended to it."
(require 'cl-seq))
(defun cl--old-struct-type-of (orig-fun object)
- (or (and (vectorp object)
+ (or (and (vectorp object) (> (length object) 0)
(let ((tag (aref object 0)))
(when (and (symbolp tag)
(string-prefix-p "cl-struct-" (symbol-name tag)))