From f9289241e06ad847904c5dc357d0ae2964fda06e Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Wed, 17 Jun 2020 21:27:10 -0300
Subject: [PATCH] add null checks for _parent.

---
 native/Avalonia.Native/src/OSX/window.mm | 37 +++++++++++++++++++-----
 1 file changed, 30 insertions(+), 7 deletions(-)

diff --git a/native/Avalonia.Native/src/OSX/window.mm b/native/Avalonia.Native/src/OSX/window.mm
index abfae3cf1e..f826df4da9 100644
--- a/native/Avalonia.Native/src/OSX/window.mm
+++ b/native/Avalonia.Native/src/OSX/window.mm
@@ -1107,7 +1107,11 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
     _lastPixelSize.Width = (int)fsize.width;
     _lastPixelSize.Height = (int)fsize.height;
     [self updateRenderTarget];
-    _parent->BaseEvents->ScalingChanged([_parent->Window backingScaleFactor]);
+    
+    if(_parent != nullptr)
+    {
+        _parent->BaseEvents->ScalingChanged([_parent->Window backingScaleFactor]);
+    }
     
     [super viewDidChangeBackingProperties];
 }
@@ -1166,7 +1170,12 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
     auto modifiers = [self getModifiers:[event modifierFlags]];
     
     [self becomeFirstResponder];
-    _parent->BaseEvents->RawMouseEvent(type, timestamp, modifiers, point, delta);
+    
+    if(_parent != nullptr)
+    {
+        _parent->BaseEvents->RawMouseEvent(type, timestamp, modifiers, point, delta);
+    }
+    
     [super mouseMoved:event];
 }
 
@@ -1290,7 +1299,10 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
     auto timestamp = [event timestamp] * 1000;
     auto modifiers = [self getModifiers:[event modifierFlags]];
      
-    _lastKeyHandled = _parent->BaseEvents->RawKeyEvent(type, timestamp, modifiers, key);
+    if(_parent != nullptr)
+    {
+        _lastKeyHandled = _parent->BaseEvents->RawKeyEvent(type, timestamp, modifiers, key);
+    }
 }
 
 - (BOOL)performKeyEquivalent:(NSEvent *)event
@@ -1381,7 +1393,10 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
 {
     if(!_lastKeyHandled)
     {
-        _lastKeyHandled = _parent->BaseEvents->RawTextInputEvent(0, [string UTF8String]);
+        if(_parent != nullptr)
+        {
+            _lastKeyHandled = _parent->BaseEvents->RawTextInputEvent(0, [string UTF8String]);
+        }
     }
 }
 
@@ -1677,7 +1692,11 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
     {
         [self showWindowMenuWithAppMenu];
         
-        _parent->BaseEvents->Activated();
+        if(_parent != nullptr)
+        {
+            _parent->BaseEvents->Activated();
+        }
+        
         [super becomeKeyWindow];
     }
 }
@@ -1794,8 +1813,12 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
 - (void)windowDidMove:(NSNotification *)notification
 {
     AvnPoint position;
-    _parent->GetPosition(&position);
-    _parent->BaseEvents->PositionChanged(position);
+    
+    if(_parent != nullptr)
+    {
+        _parent->GetPosition(&position);
+        _parent->BaseEvents->PositionChanged(position);
+    }
 }
 @end