(find-buffer-visiting): Don't check buffer-file-number

unless buffer-file-name is non-nil.

diff --git a/lisp/files.el b/lisp/files.el
index 2b3590176f3cf040c19973deed27a8cb00329b42..f36dc409e467b4b6be424e0f70777cb838f814d8 100644 (file)
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -596,7 +596,8 @@ If there is no such live buffer, return nil."
               (while (and (not found) list)
                 (save-excursion
                   (set-buffer (car list))
-                  (if (and (equal buffer-file-number number)
+                  (if (and buffer-file-name
+                           (equal buffer-file-number number)
                            ;; Verify this buffer's file number
                            ;; still belongs to its file.
                            (file-exists-p buffer-file-name)