X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=notmuch-show.c;h=a3f354edb6816c0b1b41038759a795b8da626db0;hp=7749dbc4b68ffde96b39fe81c95a993a8e708955;hb=b032cf98f55da9610b6bb971b32d79e24acb4648;hpb=933caf814fcbbb7420d03ef42bb37bea6dd90449

diff --git a/notmuch-show.c b/notmuch-show.c
index 7749dbc4..a3f354ed 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -211,6 +211,10 @@ notmuch_show_command (void *ctx, unused (int argc), unused (char *argv[]))
 
 	messages = notmuch_thread_get_toplevel_messages (thread);
 
+	if (messages == NULL)
+	    INTERNAL_ERROR ("Thread %s has no toplevel messages.\n",
+			    notmuch_thread_get_thread_id (thread));
+
 	show_messages (ctx, messages, 0);
 
 	notmuch_thread_destroy (thread);