Lawyers for the New Orleans Saints have joined NFL lawyers in opposing a fan’s lawsuit over the failure to call a crucial penalty during a playoff game.

The failure to call a roughness or pass interference call on a Los Angeles Rams cornerback helped the Rams defeat the Saints in the NFC title game and move on to the Super Bowl.

In a Wednesday night filing with Louisiana’s Supreme Court, the Saints say allowing the lawsuit to proceed would “open the door to countless legal claims” that would overburden courts, the league and the teams.

The NFL late Wednesday asked the high court to halt proceedings in the lawsuit. A lower court judge has allowed the suit to proceed and ordered that Commissioner Roger Goodell submit to questions in September.