SELECT T1.season FROM game AS T1 JOIN injury_accident AS T2 ON T1.id  =  T2.game_id WHERE T2.player  =  'Walter Samuel'
What is the season of the game which causes the player 'Walter Samuel' to get injured?
[Schema (values) (types)]: | game_injury |  stadium : id (text) , name (number) , home_games (text) , average_attendance (number) , total_attendance (number) , capacity_percentage (number) | game : stadium_id (text) , id (number) , season (text) , date (number) , home_team (number) , away_team (number) , score (number) , competition (number) | injury_accident : game_id (text) , id (number) , player (text) , injury (number) , number_of_matches (number) , source (number);