From d89bad393cdaade2e2b2cbb7616df64c846ad631 Mon Sep 17 00:00:00 2001
From: nicm <nicm@openbsd.org>
Date: Tue, 9 Jun 2026 08:11:53 +0000
Subject: [PATCH] Do not use NULL arguments, bug spotted by Dane Jensen.

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

diff --git a/usr.bin/tmux/window.c b/usr.bin/tmux/window.c
index cd5cbb26935..7968061e02b 100644
--- a/usr.bin/tmux/window.c
+++ b/usr.bin/tmux/window.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: window.c,v 1.331 2026/06/08 23:06:21 nicm Exp $ */
+/* $OpenBSD: window.c,v 1.332 2026/06/09 08:11:53 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -1233,7 +1233,7 @@ window_pane_set_mode(struct window_pane *wp, struct window_pane *swp,
 		TAILQ_INSERT_HEAD(&wp->modes, wme, entry);
 		wme->screen = wme->mode->init(wme, fs, args);
 	}
-	wme->kill = args_has(args, 'k');
+	wme->kill = args != NULL ? args_has(args, 'k') : 0;
 	wp->screen = wme->screen;
 
 	wp->flags |= (PANE_REDRAW|PANE_REDRAWSCROLLBAR|PANE_CHANGED);