What is the name of your state? California

I just received a letter (addressed to my ex) that a judgement lien has been put on my property from a creditor. 1st question. Can they put a lien on property that he has never been on title to? This debt was not listed as a debt in our divorce papers, and believe me I would know I paid it all of it. 2nd question: If this was from a bankruptcy that he had before we even met (16 years ago) can they still put a lien on my property? UGH.... He is like a nightmare that wont go away