My question involves a marriage in the state of: Florida

My husband was married prior our marriage. His court date for his divorce was August 2/2006. We were married August 19/2006. We have been married almost six years. After a few months of our marriage I found out the judge did not sign his prior divorce papers until August 24/2006. His attorney at the time said she could ask the judge to fix the date to reflect August 2/2006 which was their court date finalizing their divorce. His attorney never did and advised him to forget about it. If no one has caught the error than let it be. So do I need to proceed with a divorce or we not even technically married? How do I handle this? We have one child together.