A New Jersey appeals court ruled that a Riverdale law firm and one of its partners cannot be sued for malpractice based on a former client’s claim that she was shortchanged in a divorce settlement because of mental incapacity.

The Appellate Division agreed with a Passaic County trial judge that plaintiff Lynda Dillman could not demonstrate that she was suffering from mental instability at the time she signed the property settlement agreement with her husband, Scott, and did not fully understand its implications.