From a1d5833c8aa2f85817ad3c3cd64e0e618e8c695e Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Sat, 30 Jun 2018 11:06:41 +0300
Subject: [PATCH] - reset framebuffer pointer on destruction in Cocoa backend

Added debug validation of framebuffer pointer as well
---
 src/posix/cocoa/i_video.mm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/posix/cocoa/i_video.mm b/src/posix/cocoa/i_video.mm
index f4f03f2df..b3e422a26 100644
--- a/src/posix/cocoa/i_video.mm
+++ b/src/posix/cocoa/i_video.mm
@@ -386,6 +386,7 @@ SystemGLFrameBuffer::SystemGLFrameBuffer(void*, const bool fullscreen)
 		}
 	}
 
+	assert(frameBuffer == nullptr);
 	frameBuffer = this;
 
 	FConsoleWindow::GetInstance().Show(false);
@@ -393,6 +394,9 @@ SystemGLFrameBuffer::SystemGLFrameBuffer(void*, const bool fullscreen)
 
 SystemGLFrameBuffer::~SystemGLFrameBuffer()
 {
+	assert(frameBuffer == this);
+	frameBuffer = nullptr;
+
 	NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
 	[nc removeObserver:m_window
 				  name:NSWindowDidMoveNotification