diff --git a/Cocoa/GBOpenGLView.m b/Cocoa/GBOpenGLView.m
index fd845e1..8831b62 100644
--- a/Cocoa/GBOpenGLView.m
+++ b/Cocoa/GBOpenGLView.m
@@ -13,12 +13,14 @@
     double scale = self.window.backingScaleFactor;
     glViewport(0, 0, self.bounds.size.width * scale, self.bounds.size.height * scale);
     
-    [self.shader renderBitmap:gbview.currentBuffer
-                     previous:gbview.frameBlendingMode? gbview.previousBuffer : NULL
-                        sized:NSMakeSize(GB_get_screen_width(gbview.gb), GB_get_screen_height(gbview.gb))
-                       inSize:self.bounds.size
-                        scale:scale
-             withBlendingMode:gbview.frameBlendingMode];
+    if (gbview.gb) {
+        [self.shader renderBitmap:gbview.currentBuffer
+                         previous:gbview.frameBlendingMode? gbview.previousBuffer : NULL
+                            sized:NSMakeSize(GB_get_screen_width(gbview.gb), GB_get_screen_height(gbview.gb))
+                           inSize:self.bounds.size
+                            scale:scale
+                 withBlendingMode:gbview.frameBlendingMode];
+    }
     glFlush();
 }
 
diff --git a/Cocoa/GBViewMetal.m b/Cocoa/GBViewMetal.m
index 093ed2a..4c8a5d5 100644
--- a/Cocoa/GBViewMetal.m
+++ b/Cocoa/GBViewMetal.m
@@ -23,7 +23,7 @@ static const vector_float2 rect[] =
 + (bool)isSupported
 {
     if (MTLCopyAllDevices) {
-        return false; //[MTLCopyAllDevices() count];
+        return [MTLCopyAllDevices() count];
     }
     return false;
 }