+++ /dev/null
---- mutt-1.3.18/send.c Thu Apr 26 15:17:49 2001
-+++ mutt-1.3.18-p/send.c Wed May 30 13:30:10 2001
-@@ -630,8 +630,10 @@
- else
- {
- env->references = mutt_make_references (curenv);
-- env->in_reply_to = mutt_new_list ();
-- env->in_reply_to->data = safe_strdup (curenv->message_id);
-+ if (curenv->message_id) {
-+ env->in_reply_to = mutt_new_list ();
-+ env->in_reply_to->data = safe_strdup (curenv->message_id);
-+ }
- }
- }
-