Android FirebaseFirestore积垢，引发异常

我基本上是在FirebaseFirestore上尝试CRUD，添加用户成功，但删除和更新用户信息会引发错误：

代码库非常简单。add（）按预期工作，但update（）和delete（）未显示 期望的结果

我的代码：

添加用户方法-

 addUser() {
    User user = User(name: controller.text );
    try {
       FirebaseFirestore.instance.runTransaction((transaction) async{
       await FirebaseFirestore.instance.collection(CollectionName).doc().set(user.toJson());
      },);
    }catch(e){
      print(e.toString());
    }
  }
  add(){
    if(isEditing){
      update(curUser, controller.text);
      setState(() {
        isEditing = false;
      });
    }else{
      addUser();
    }
    controller.text = '';
  }

删除用户记录-

 delete(User user){
    FirebaseFirestore.instance.runTransaction((transaction) async {
      transaction.delete(user.reference);
    },
    );
  }

更新记录-

  update(User user, String newName) {
    try {
      FirebaseFirestore.instance.runTransaction((transaction) async {
        await transaction.update(user.reference, {'name': newName});
      });
    } catch (e) {
      print(e.toString());
    }
  }

我收到的错误是：

   ════════ Exception caught by the gesture ═══════════════════════════════════════════════════════════════
Stack Overflow
════════════════════════════════════════════════════════════════════════════════════════════════════
W/h.crud_firebas( 5985): Accessing hidden method Lsun/misc/Unsafe;->putLong(Ljava/lang/Object;JJ)V (greylist, linking, allowed)