diff --git a/src/native/macosx/OSXWindowFrameView.m b/src/native/macosx/OSXWindowFrameView.m
index b5dd20d..5b3a992 100644
--- a/src/native/macosx/OSXWindowFrameView.m
+++ b/src/native/macosx/OSXWindowFrameView.m
@@ -24,20 +24,20 @@
 
 - (void)drawRect:(NSRect)rect
 {
-	CGContextRef context = [[NSGraphicsContext currentContext] graphicsPort];
+    CGContextRef context = [[NSGraphicsContext currentContext] graphicsPort];
 
-	CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
-	CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, draw_buffer, width * height * 4, NULL);
+    CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
+    CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, draw_buffer, width * height * 4, NULL);
 
-	CGImageRef img = CGImageCreate(width, height, 8, 32, width * 4, space, kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little,
-								   provider, NULL, false, kCGRenderingIntentDefault);
+    CGImageRef img = CGImageCreate(width, height, 8, 32, width * 4, space, kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little,
+                                   provider, NULL, false, kCGRenderingIntentDefault);
 
-	CGColorSpaceRelease(space);
-	CGDataProviderRelease(provider);
+    CGColorSpaceRelease(space);
+    CGDataProviderRelease(provider);
 
-	CGContextDrawImage(context, CGRectMake(0, 0, width * scale, height * scale), img);
+    CGContextDrawImage(context, CGRectMake(0, 0, width * scale, height * scale), img);
 
-	CGImageRelease(img);
+    CGImageRelease(img);
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -109,27 +109,30 @@
 
 - (void)viewDidMoveToWindow
 {
-	[[NSNotificationCenter defaultCenter] addObserver:self
-	selector:@selector(windowResized:) name:NSWindowDidResizeNotification
-	object:[self window]];
+    [[NSNotificationCenter defaultCenter] addObserver:self
+    selector:@selector(windowResized:) name:NSWindowDidResizeNotification
+    object:[self window]];
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 - (void)dealloc
 {
-	[[NSNotificationCenter defaultCenter] removeObserver:self];
-	[super dealloc];
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+    [super dealloc];
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 - (void)windowResized:(NSNotification *)notification;
 {
-	NSSize size = [self bounds].size;
+    NSSize size = [self bounds].size;
     OSXWindow* window = (OSXWindow*)[self window];
-    window->shared_data->width = (int)(size.width);
-    window->shared_data->height = (int)(size.height);
+
+    if (window->shared_data) {
+        window->shared_data->width = (int)(size.width);
+        window->shared_data->height = (int)(size.height);
+    }
 }
 
 @end