Sometimes, you lose clients because you were stupid; others, however, you lose through no fault of your own. For example, your biggest client has been a steady source of income for many years, but suddenly they declare bankruptcy. All of a sudden, you and your team are sent scrambling to find new sources of revenue. All of this can be avoided by taking a few simple steps. Here are 12 Crucial Actions to Protect Your Business When a Large Client Goes Under.