There is literally nothing that is stopping you from doing a double MBA. Many students are not satisfied with the brand value or outcome of their first MBA degree and might opt for a double MBA from a better B School with clearer goals.
But if you are doing so, make sure you have a credible story up your sleeve to explain why you need a second MBA.
Prepare such questions well and ponder on the real reason why you are found for another MBA. Rather than a hasty decision, you can also wait for a few years and see if a second MBA is really necessary.