"In-Reply-To", in_reply_to);
orig_references = notmuch_message_get_header (message, "references");
+ if (!orig_references)
+ /* Treat errors like missing References headers. */
+ orig_references = "";
references = talloc_asprintf (ctx, "%s%s%s",
- orig_references ? orig_references : "",
- orig_references ? " " : "",
+ *orig_references ? orig_references : "",
+ *orig_references ? " " : "",
in_reply_to);
g_mime_object_set_header (GMIME_OBJECT (reply),
"References", references);