GCop405 false alarm

[sungam3r]

 internal class Inspector
        {
            public static IEnumerable<string> Inspect(Type type)
            {
                if (type != null)
                {
                    foreach (var property in type.GetProperties())
                        yield return property.Name;
                }
            }
        }

declares

GCop405	You should use 
foreach (var property in type?.GetProperties())
                    yield return property.Name;

but in runtime it gives

System.NullReferenceException: 'Object reference not set to an instance of an object.'

if I call

Inspector.Inspect(null);