From 05249dc19133b27a483a1d363b11b9ebc57412d6 Mon Sep 17 00:00:00 2001
From: David Capello <davidcapello@gmail.com>
Date: Tue, 3 Nov 2015 16:14:05 -0300
Subject: [PATCH] Fix crash closing the window when it's on fullscreen mode on
 OS X

---
 src/allegro/src/macosx/system.m | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/allegro/src/macosx/system.m b/src/allegro/src/macosx/system.m
index df50d2a77..f2c41d25f 100644
--- a/src/allegro/src/macosx/system.m
+++ b/src/allegro/src/macosx/system.m
@@ -198,11 +198,15 @@ void osx_event_handler()
    int event_type;
    BOOL gotmouseevent = NO;
 
-   while ((event = [NSApp nextEventMatchingMask: NSAnyEventMask
-                                      untilDate: [NSDate distantPast]
-                                         inMode: NSDefaultRunLoopMode
-                                        dequeue: YES]))
+   while (osx_window != nil)
    {
+     event = [NSApp nextEventMatchingMask: NSAnyEventMask
+                                untilDate: [NSDate distantPast]
+                                   inMode: NSDefaultRunLoopMode
+                                  dequeue: YES];
+     if (!event)
+       return;
+
      BOOL send_event = YES;
 
       _unix_lock_mutex(osx_skip_events_processing_mutex);