(tar-mode-write-file): Protect from null tar-header-offset.

diff --git a/lisp/tar-mode.el b/lisp/tar-mode.el
index c2d2033..dd12d9b 100644 (file)
--- a/lisp/tar-mode.el
+++ b/lisp/tar-mode.el
@@ -1205,7 +1205,10 @@ Leaves the region wide."
        ;; Doing this here confuses things - the region gets left too wide!
        ;; I suppose this is run in a context where changing the buffer is bad.
        ;; (tar-pad-to-blocksize)
-       (write-region tar-header-offset (point-max) buffer-file-name nil t)
+       ;; tar-header-offset turns out to be null for files fetched with W3,
+       ;; at least.
+       (write-region (or tar-header-offset (point-min)) (point-max)
+                     buffer-file-name nil t)
        (tar-clear-modification-flags)
        (set-buffer-modified-p nil))
     (narrow-to-region 1 tar-header-offset))