When CreateRenderer fails, the GraphicsContext that was std::move'd into it is destroyed before the Scoped that was created to manage its currency. In that case, the GraphicsContext::Scoped will still call its destructor at the ending of the function. And because the context is destroyed, the Scoped will cause a crash as it attempts to call a destroyed object's DoneCurrent function. Since we know when the call would be invalid, call the Scoped's Cancel method. This prevents it from calling a method on a destroyed object.