1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/files.el b/lisp/files.el
index f48e38cc686..584aef9f456 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -1423,7 +1423,7 @@ if you wish to pass an empty string as the argument."
           (setq truename (file-truename filename))
           (if find-file-visit-truename
               (setq filename truename))))
-    (let ((buffer (find-buffer-visiting filename)))
+    (let ((buffer (and filename (find-buffer-visiting filename))))
       (and buffer (not (eq buffer (current-buffer)))
            (not (y-or-n-p (message "A buffer is visiting %s; proceed? "
                                    filename)))