### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Electron Version

12.0.0

### What operating system are you using?

macOS

### Operating System Version

10.14.0

### What arch are you using?

x64

### Last Known Working Electron version

---

### Expected Behavior

No crash when calling method

### Actual Behavior

App crashes when calling `getBackgroundColr()`

### Testcase Gist URL

https://gist.github.com/d50e366f070104cac377fd7a48722cbe

### Additional Information

_No response_


shell/browser/native_window_views.cc
return new NativeWindowClientView(widget, root_view_.get(), this);
}
std::unique_ptr<views::NonClientFrameView>
NativeWindowViews::CreateNonClientFrameView(views::Widget* widget) {
#if defined(OS_WIN)
  auto frame_view = std::make_unique<WinFrameView>();
  frame_view->Init(this, widget);
  return frame_view;
#else
  if (has_frame()) {
    return std::make_unique<NativeFrameView>(this, widget);
  } else {
    auto frame_view = std::make_unique<FramelessView>();
    frame_view->Init(this, widget);
    return frame_view;
  }
#endif
}
void NativeWindowViews::OnWidgetMove() {