An attorney who misses a filing deadline can be sued for malpractice.  A classic case of malpractice is missing the filing deadline in a personal injury case when that filing deadline is the statute of limitations.  If your claim is now barred because of the missed filing deadline, you could have filed a lawsuit for malpractice; however, since your attorney filed bankruptcy, you won't be able to proceed with your lawsuit.You might want to contact the  CA State Bar because the attorney could still be subject to discipline for having missed the filing deadline in your personal injury case.