From 142a41b3863cbce4fe40a7bbf30ee48c0c28b672 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Tue, 15 Oct 2019 12:16:00 +0100
Subject: [PATCH] make copy of array.

---
 native/Avalonia.Native/src/OSX/window.mm | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/native/Avalonia.Native/src/OSX/window.mm b/native/Avalonia.Native/src/OSX/window.mm
index fc6ff0f32c..9c7e9323e0 100644
--- a/native/Avalonia.Native/src/OSX/window.mm
+++ b/native/Avalonia.Native/src/OSX/window.mm
@@ -1078,11 +1078,12 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
 
 +(void)closeAll
 {
-    auto numWindows = [[NSApp windows] count];
+    NSArray<NSWindow*>* windows = [NSArray arrayWithArray:[NSApp windows]];
+    auto numWindows = [windows count];
     
     for(int i = 0; i < numWindows; i++)
     {
-        [[[NSApp windows] objectAtIndex:i] performClose:nil];
+        [[windows objectAtIndex:i] performClose:nil];
     }
 }