Invalid claims are draft picks which are deemed invalid by the National Hockey League or any other league's authority, for a reason or another. Invalid claims are not a common occurence, as it ends up penalizing the team making such a claim, who ends up with one less player selected; invalid claims therefore end up being accidents, with teams accidentally picking a player that was already picked by another previously, for instance. It has however happened that a draft pick is voluntarily wasted by a team in order to make an invalid claim.