If your husband does not have insurance on the vehicle and was in an accident, it is likely that you could be held liable because you on the lease with him. As a signer on the lease you are responsible for those that drive the car and what occurs to the vehicle while they are driving, this is called vicarious liability.
Also, if the vehicle is registered under your name and there is a lapse in insurance it will go on your driving record. State laws differ but penalties for a lapse in insurance can include losing your driving privileges and suspension of the license plates to name a couple.
You can contact the company which you leased the vehicle through to see if the insurance needs to be in your name or if you can drop your insurance on the vehicle if your husband puts the proper insurance on it and has the car registered in his name.
Make certain that the leased car has enough insurance on it so that you and your assets are not at risk if the vehicle is in an accident. If you need insurance quotes for your leased vehicle or another car, follow this link for affordable auto insurance.