Unhandled Exception: type 'Null' is not a subtype of type 'int'

[hemanthkb97]

New Issue Checklist

• [ x] I am not disclosing a vulnerability.
• [ x] I am not just asking a question.
• [x ] I have searched through existing issues.
• [ x] I can reproduce the issue with the latest version of the Parse Flutter SDK.
• [ x] I can reproduce the issue with the latest version of Parse Server.

Issue Description

Im getting error when i try to save object

Steps to reproduce

savefollow() async {
    ParseUser? currentuser = await ParseUser.currentUser();
    if (currentuser != null) {
      if (isprivate) {
      } else {
        QueryBuilder<ParseUser> follows =
            QueryBuilder<ParseUser>(ParseUser.forQuery());
        follows.whereEqualTo("username", username);
        var res = await follows.query();
        if (res.success) {
          ParseUser followsuser = res.results!.first;
          ParseObject followsave = ParseObject("Follow");
          followsave.set("user", currentuser);
          followsave.set("follows", followsuser);
          followsave.set("status", "following");
          var response = await followsave.save();
        }
      }
    }
  }

Actual Outcome

I/flutter (11081): ╭-- Parse Request
I/flutter (11081): curl -X GET -H 'user-agent: Flutter Parse SDK 3.1.0' -H 'X-Parse-Application-Id: ' -H 'X-Parse-Session-Token: ' -H 'X-Parse-Client-Key: ' https://parseapi.back4app.com/classes/_User?where=%7B%22username%22:%20%22jathin%22%7D
I/flutter (11081):
I/flutter (11081): https://parseapi.back4app.com/classes/_User?where={"username": "jathin"}
I/flutter (11081): ╰--
I/flutter (11081): ╭-- Parse Response
I/flutter (11081): Class: _User
I/flutter (11081): Function: ParseApiRQ.query
I/flutter (11081): Status Code: 200
I/flutter (11081): Payload: [{"className":"_User","objectId":"ptkI67Y2TP","createdAt":"2021-08-14T06:42:49.752Z","updatedAt":"2021-08-14T06:44:07.324Z","username":"jathin","your":[],"verified":false,"private":false,"about":"Nothing here","emailVerified":true,"anonymoususername":true,"fullname":"Jathin","dob":"29/7/1996","gender":"man","publicdata":{"__type":"Pointer","className":"Userpublicdata","objectId":"qdXw3h7L0G"},"ACL":{"*":{"read":true,"write":false},"ptkI67Y2TP":{"read":true,"write":true}}}]
I/flutter (11081): ╰--
I/flutter (11081):
I/flutter (11081): ╭-- Parse Request
I/flutter (11081): curl -X POST -H 'content-type: text/plain; charset=utf-8' -H 'user-agent: Flutter Parse SDK 3.1.0' -H 'X-Parse-Application-Id: ' -H 'X-Parse-Session-Token: r:f3b9ded81a9875bf4eb3f60e124b04c5' -H 'X-Parse-Client-Key: ' -d '{"requests":[{"method":"PUT","path":"/classes/_User/ptkI67Y2TP","body":{"username":"jathin"}}]}' https://parseapi.back4app.com/batch
I/flutter (11081):
I/flutter (11081): https://parseapi.back4app.com/batch
I/flutter (11081): ╰--
E/flutter (11081): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: type 'Null' is not a subtype of type 'int'
E/flutter (11081): #0 _ParseResponseBuilder._handleSuccess
E/flutter (11081): #1 _ParseResponseBuilder.handleResponse
E/flutter (11081): #2 handleResponse
E/flutter (11081): #3 batchRequest
E/flutter (11081):
E/flutter (11081): #4 ParseObject._saveChildren
E/flutter (11081):
E/flutter (11081): #5 ParseObject.save
E/flutter (11081):
E/flutter (11081): #6 _NOprofileState.savefollow
E/flutter (11081):
E/flutter (11081):

Expected Outcome

Pull Request

• 🤩 I submitted a PR with a fix.

Environment

Parse Flutter SDK

• SDK version: 3.1.0
• Operating system: windows 11
• Operating system version: FILL_THIS_OUT

Server

• Parse Server version: FILL_THIS_OUT
• Operating system: FILL_THIS_OUT
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): b4a

Database

• System (MongoDB or Postgres): MongoDB
• Database version: FILL_THIS_OUT
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): b4a

Logs

[hemanthkb97]

needed use master key