Don't try to jump to non-existent part (bug#28013)

* lisp/gnus/gnus-art.el (gnus-article-edit-part): Don't try to jump to
the next part if there is the only one part in the article (bug#28013).

1 files changed, 8 insertions, 5 deletions

diff --git a/lisp/gnus/gnus-art.el b/lisp/gnus/gnus-art.el
index 3f384c65ece..ce0ff2ee8c0 100644
--- a/lisp/gnus/gnus-art.el
+++ b/lisp/gnus/gnus-art.el
@@ -5058,11 +5058,14 @@ and `gnus-mime-delete-part', and not provided at run-time normally."
       (gnus-article-edit-done))
     (gnus-configure-windows 'article)
     (sit-for 0)
-    (when (and current-id (integerp gnus-auto-select-part))
-      (gnus-article-jump-to-part
-       (min (max (+ current-id gnus-auto-select-part) 1)
-            (with-current-buffer gnus-article-buffer
-              (length gnus-article-mime-handle-alist)))))))
+    (let ((handles (with-current-buffer gnus-article-buffer
+                     gnus-article-mime-handle-alist)))
+      ;; `handles' will be nil if there is the only one part
+      ;; in the article and is deleted.
+      (when (and handles current-id (integerp gnus-auto-select-part))
+        (gnus-article-jump-to-part
+         (min (max (+ current-id gnus-auto-select-part) 1)
+              (length handles)))))))
 
 (defun gnus-mime-replace-part (file)
   "Replace MIME part under point with an external body."