From 1e6e925d08da4b008b2daa8f9987b2d8458d071f Mon Sep 17 00:00:00 2001
From: Ry <ryanst755@gmail.com>
Date: Wed, 28 Dec 2022 00:05:15 -0800
Subject: [PATCH] kernel: Don't crash when all windows are closed

---
 kernel/window/window.asm | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/kernel/window/window.asm b/kernel/window/window.asm
index 1755279..ce15aba 100644
--- a/kernel/window/window.asm
+++ b/kernel/window/window.asm
@@ -202,6 +202,8 @@ destroy_window:
     ; set the active window to whatever entry is found first
     call search_for_nonempty_window_list_entry
     mov.8 [active_window_offset], r0
+    cmp r0, 0xFFFFFFFF
+    ifz jmp destroy_window_no_more_windows
 
     ; set the menu bar for the newly active window
     call window_list_offset_to_struct
@@ -214,6 +216,12 @@ destroy_window:
     cmp r0, 0
     ifnz call draw_menu_bar_root_items
 
+    pop r1
+    pop r0
+    ret
+destroy_window_no_more_windows:
+    call disable_menu_bar
+
     pop r1
     pop r0
     ret