Can unpaid creditors come after me personally in a LLC?

We have an unpaid electric bill from the previous electric provider at our property. We own this property under an LLC. Its a large multi-family property and tomorrow we get foreclosed. Given that we still owe the previous electric provider $15k, can they come after us personally? We never guaranteed anything, but if the LLC is broke, can they sue us personally for the balance due? How can we get around this?