hello there, I made a Future method and used that in a FutureBuilder but for some reason I end in a endless loop:

Future<Map<String, String>> fetchGroups() async {

    _parseObject = ParseObject("wecar_groups", wcs.user.client);

    var list = await wcs.user.get('groups');

    setState(() {

      groupIds = list.cast<String>();

    });



    groupIds.forEach((String val) async {

      var group = await _parseObject.fetch(val);

        groupNames.addAll({val: Group.fromJson(group['group']).name});

    });

  }



final selectGroup = FutureBuilder(

      future: fetchGroups(),

      builder: (context, snapshot) {

        if(snapshot.connectionState == ConnectionState.done){

          return Row(

            crossAxisAlignment: CrossAxisAlignment.end,

            children: <Widget>[

              Expanded(

                flex: 5,

                child: InputDecorator(

                  baseStyle: Theme.of(context).textTheme.title,

                  decoration: const InputDecoration(

                    labelText: 'Gruppen',

                  ),

                  child: DropdownButton<String>(

                    value: _card.group,

                    hint: Text("Wählen Sie eine Gruppe aus:"),

                    //style: style,

                    isDense: false,

                    onChanged: (String newValue) {

                      setState(() {

                        _card.group = newValue;

                      });

                    },

                    items: groupIds.map((String value) {

                      return DropdownMenuItem<String>(

                        value: value,

                        child: Text(groupNames[value]),

                      );

                    }).toList(),

                  ),

                ),

              ),

              Expanded(

                  flex: 1,

                  child: IconButton(

                    icon: Icon(Icons.add_circle_outline),

                    onPressed: null,

                  )),

            ],

          );

        } else {

          print(snapshot);

            return CircularProgressIndicator();

        }

      },

    );