A federal appeals court rebuffed an attempt by a group of corn farmers to pursue claims against its former counsel, whom the farmers allege gave faulty advice in an underlying lawsuit over genetically modified corn-seed products.

The U.S. Court of Appeals for the 10th Circuit upheld the district court’s dismissal of claims brought by the so-called Kellogg farmers against their own attorneys for allegedly failing to disclose the benefits of participating as class members in a mass litigation against Syngenta, an agricultural company, according to the opinion.