Cannot send to database after update

Question

I'm a new flutter user, so this time I'm having problems when I want to update the data can't be sent (save) to the database. because there is no error but the data is not saved. Please help me

This is my problem https://www.youtube.com/watch?v=38ZoHWsJ47k

Function update

 void _update() async {
        setState(() {
          _isLoading = true;
        });
    
        Map<String, String> data = {
          "body1" : _nama_debiturController.text,
          "body2": _alamatController.text,
          "body3": _no_telpController.text,
          "body4" : _no_ktpController.text,
          "body5" : _no_selularController.text
        };
        print(data);
    
        var res = await Network().updateData(data, 'mstdebitur');
        var body = json.decode(res.body);
        if (res.statusCode == 200) {
          SharedPreferences localStorage = await SharedPreferences.getInstance();
          localStorage.setString('mstdebitur', json.encode(body['mstdebitur']));
          ScaffoldMessenger.of(context).showSnackBar(SnackBar(
            content: Text('Berhasil Disimpan'),
            duration: Duration(seconds: 2),
          ));
    
        } else {
          if (body['message']['nama_debitur'] != null) {
            _showMsg(body['message']['nama_debitur'][0].toString());
          } else if (body['message']['alamat'] != null) {
            _showMsg(body['message']['alamat'][0].toString());
          } else if (body['message']['no_telp'] != null) {
            _showMsg(body['message']['no_telp'][0].toString());
          }
          else if (body['message']['no_ktp'] != null) {
            _showMsg(body['message']['no_ktp'][0].toString());
          }
          else if (body['message']['no_selular'] != null) {
            _showMsg(body['message']['no_selular'][0].toString());
          }
          ScaffoldMessenger.of(context)
              .showSnackBar(new SnackBar(content: Text("Gagal")));
        }
        setState(() {
          _isLoading = false;
        });
      }
    }

api.dart

updateData(apiURL, id, body) async {
    var fullUrl = _url + apiURL + '/' + id.toString();
    await _getToken();
    return await http.put(
      fullUrl,
      headers: _setHeaders(),
      body: json.encode(body),
    );
  }

nasabah_service.dart

  static Future<List<Nasabah>> updateUser(id) async {
    Map<String, String> data;
    final response = await Network().updateData(baseUrl, id, data);
    List<Nasabah> list = parseResponse(response.body);
    return list;
  }

can you help me ? Because