From d46b21a96501f94d8c6b8dc5917de06f5b214c7b Mon Sep 17 00:00:00 2001
From: mebibytedraco <139500397+mebibytedraco@users.noreply.github.com>
Date: Mon, 24 Jul 2023 23:36:33 -0400
Subject: [PATCH] Handle case where there is no active window

---
 kernel/window/window.asm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/window/window.asm b/kernel/window/window.asm
index 906d0fd..8c5eb29 100644
--- a/kernel/window/window.asm
+++ b/kernel/window/window.asm
@@ -150,6 +150,11 @@ new_window:
     call get_window_overlay_number ; get the overlay number of the new window
     mov r10, r0
     mov.8 r0, [active_window_offset] ; get the active window's overlay number
+    cmp r0, 0xFF ; is there no active window?
+    ifnz jmp new_window_active_window
+    pop r0
+    jmp new_window_skip_swap
+new_window_active_window:
     mul r0, 4
     add r0, window_list
     mov r1, [r0]
@@ -159,6 +164,7 @@ new_window:
     pop r0
     cmp r11, r10 ; if the active window is on a higher overlay, swap
     ifnc call swap_windows
+new_window_skip_swap:
 
     ; finally, add this window to the window list
     push r0