#fixed code
                              public Result<TokenInfo> getTokenInfo(String accessToken) {
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    weibo.addParameter(params, "access_token", accessToken);
    String result = weibo.post("https://api.weibo.com/oauth2/get_token_info", params);
    return Result.parse(result, TokenInfo.class);
  }
#vulnerable code 
                              public Result<TokenInfo> getTokenInfo(String accessToken) {
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    weibo.addParameter(params, "access_token", accessToken);
    String result = weibo.post("https://api.weibo.com/oauth2/get_token_info", params);
    return Result.perse(result, TokenInfo.class);
  } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE