A U.S. judge has dismissed a proposed class action accusing MGM Resorts, Caesars Entertainment and other hotel operators in Las Vegas of conspiring to overcharge for room rates in violation of U.S. antitrust law.

In a 13-page order, Chief U.S. District Judge Miranda Du in Nevada on Tuesday said the consumer lawsuit against the hotel companies and a pricing software platform suffered from “ambiguity” and “numerous deficiencies.” Du said the plaintiffs could file an amended lawsuit within 30 days.

Du did not rule on the merits of the lawsuit’s underlying antitrust claims. The defendants have denied wrongdoing.

The other defendants included Wynn Resorts, Treasure Island and Cendyn, a revenue management software developer for the hospitality industry.