From 1bc11bb8077031101fd05a4ddb877404f4eb6829 Mon Sep 17 00:00:00 2001
From: kanato <kanato@ebc5dd9b-fb1d-0410-b6f8-d24c324e9604>
Date: Sun, 15 Nov 2009 22:00:14 +0000
Subject: [PATCH] MacOS: Fix crash in CheckEnterLeaveEvents if using WinForms
 too.

---
 Source/OpenTK/Platform/MacOS/CarbonGLNative.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Source/OpenTK/Platform/MacOS/CarbonGLNative.cs b/Source/OpenTK/Platform/MacOS/CarbonGLNative.cs
index df28debc..ee8a247a 100644
--- a/Source/OpenTK/Platform/MacOS/CarbonGLNative.cs
+++ b/Source/OpenTK/Platform/MacOS/CarbonGLNative.cs
@@ -563,6 +563,9 @@ namespace OpenTK.Platform.MacOS
 
 		private void CheckEnterLeaveEvents(IntPtr eventWindowRef, Point pt)
 		{
+			if (window == null)
+				return;
+
 			bool thisIn = eventWindowRef == window.WindowRef;
 
 			if (pt.Y < 0)