From 3ece9b2c717a9e2505096cd14b906bad3511b088 Mon Sep 17 00:00:00 2001
From: nicm <nicm@openbsd.org>
Date: Fri, 11 Aug 2023 17:09:00 +0000
Subject: [PATCH] Do not crash if in buffer mode and the last buffer is deleted
 using the command.

---
 usr.bin/tmux/mode-tree.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/usr.bin/tmux/mode-tree.c b/usr.bin/tmux/mode-tree.c
index 08a5c294f5f..7951cc8d0df 100644
--- a/usr.bin/tmux/mode-tree.c
+++ b/usr.bin/tmux/mode-tree.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: mode-tree.c,v 1.64 2023/08/08 08:08:47 nicm Exp $ */
+/* $OpenBSD: mode-tree.c,v 1.65 2023/08/11 17:09:00 nicm Exp $ */
 
 /*
  * Copyright (c) 2017 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -497,7 +497,7 @@ mode_tree_build(struct mode_tree_data *mtd)
 	mode_tree_clear_lines(mtd);
 	mode_tree_build_lines(mtd, &mtd->children, 0);
 
-	if (tag == UINT64_MAX)
+	if (mtd->line_list != NULL && tag == UINT64_MAX)
 		tag = mtd->line_list[mtd->current].item->tag;
 	mode_tree_set_current(mtd, tag);
 
-- 
2.20.1