From bc05e7056743fd5163f3aae796f8c5e08c878215 Mon Sep 17 00:00:00 2001
From: Thomas Roessler <roessler@does-not-exist.org>
Date: Mon, 17 Jul 2000 07:27:43 +0000
Subject: [PATCH] Fix #192.

---
 curs_main.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/curs_main.c b/curs_main.c
index e114f14d..b92429ac 100644
--- a/curs_main.c
+++ b/curs_main.c
@@ -1425,7 +1425,13 @@ int mutt_index_menu (void)
 
       case OP_MAIN_COLLAPSE_THREAD:
 	CHECK_MSGCOUNT;
-	
+
+        if ((Sort & SORT_MASK) != SORT_THREADS)
+        {
+	  mutt_error _("Threading is not enabled.");
+	  break;
+	}
+      
 	if (CURHDR->collapsed)
 	{
 	  menu->current = mutt_uncollapse_thread (Context, CURHDR);
-- 
2.40.0