Help with custom type

[erikphilips]

tGameStatus = (gsLoadSettings, gsCreateDisplay, gsStart, gsTesting);

    gameStatus: tGameStatus;
    gameStatusNext: tGameStatus;

  if (gameActive and gameFocus) then
  try
    case gameStatus of
      (gsLoadSettings): 
      begin
        if (gameStatusNext = nil) then
        gameStatus := gsCreateDisplay;
      end;
      (gsCreateDisplay):
      begin
        gameDisplay := cGraphics.Create(handle);
      end;
    else
      gameUtils.dialogFatal('Unknown Game Status!');
      application.Terminate;
    end;
  end;

Anyway, it obviously fails at if gameStatusNext, if i have not assigned GameStatusNext, what is it? How do i see if there is a next status?