From f0809a667fe1369809233589e17455d9599f4804 Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Fri, 19 Jul 2019 15:50:36 +0300
Subject: [PATCH] Fixed a potential Cocoa crash when closing a window

---
 Cocoa/Document.m    | 1 +
 Cocoa/GBViewMetal.m | 1 +
 2 files changed, 2 insertions(+)

diff --git a/Cocoa/Document.m b/Cocoa/Document.m
index b99e4c8..a520d62 100644
--- a/Cocoa/Document.m
+++ b/Cocoa/Document.m
@@ -389,6 +389,7 @@ static void audioCallback(GB_gameboy_t *gb, GB_sample_t *sample)
 - (void)dealloc
 {
     [cameraSession stopRunning];
+    self.view.gb = NULL;
     GB_free(&gb);
     if (cameraImage) {
         CVBufferRelease(cameraImage);
diff --git a/Cocoa/GBViewMetal.m b/Cocoa/GBViewMetal.m
index 9acb11e..94b4975 100644
--- a/Cocoa/GBViewMetal.m
+++ b/Cocoa/GBViewMetal.m
@@ -131,6 +131,7 @@ static const vector_float2 rect[] =
 - (void)drawInMTKView:(nonnull MTKView *)view
 {
     if (!(view.window.occlusionState & NSWindowOcclusionStateVisible)) return;
+    if (!self.gb) return;
     if (texture.width  != GB_get_screen_width(self.gb) ||
         texture.height != GB_get_screen_height(self.gb)) {
         [self allocateTextures];