The nested query is not supported. Operation1='Case' Operation2='Collect'

IQueryable<Map.League> v = from ul in userLeagues
                    select new Map.League
                    {
                        id = ul.LeagueID,
                        seasons = inc.Seasons ? (from ss in ul.Standings
                                                 where ss.LeagueID == ul.LeagueID
                                                 select new Map.Season
                                                 {
                                                      seasonId = ss.Season.SeasonId,
                                                      seasonName = ss.Season.SeasonName
                                                 }).ToList() : null,
                    };

seasons =  (from ss in ul.Standings
                                                 where ss.LeagueID == ul.LeagueID
                                                 select new Map.Season
                                                 {
                                                     seasonId = ss.Season.SeasonId,
                                                     seasonName = ss.Season.SeasonName
                                                 }).Distinct(),