It depends on whether you issued or signed the bond only as the LLC (e.g. signing it as "Managing Member, LLC" or "President, LLC" or something else to that same effect) or in your personal capacity (just your name, not as a member/officer of the LLC). If only by the LLC, then only the LLC is liable; if personally, then you are liable. With an LLC, members or managers are only personally liable to the exent they personally assume or take out the obligation.