Explicit concurrent copying GC freed 7041(512KB) AllocSpace objects error

Question

I'm using Xamarin Forms framework for android and iOS mobile platform, on iOS devices it work's well but in Android when going on a specific page app shut down.

I got this error : Explicit concurrent copying GC freed 7041(512KB) AllocSpace objects

Using breakpoint I noticed crash arrived executing this

var content = JsonConvert.SerializeObject(
                            newStorageUsers,
                            Formatting.None,
                            new JsonSerializerSettings()
                            {
                                ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                            });

I show you entire demo code

Page in which I got error

private readonly IStorageUserService _storageService
public MyPage(User user)
{
   InitializeComponent();
   ...
   _storageService = new StorageUserServiceImpl();
   _storageService.StoreUser(user);
   ...
}

Service Interface

public interface IStorageUserService
{
    void StoreUser(User user);
}

Service Implementation

public class StorageUserServiceImpl : IStorageUserService
{
    private string _usersPathFile = Path.Combine(App.GetPackagePath(), "users.txt");
    public StorageUserServiceImpl()
    {
        if (!File.Exists(_usersPathFile))
        {
            _createUsersFile();
        }
    }

    private void _createUsersFile()
    {
        var file = File.Create(_usersPathFile);
        file.Close();
    }

    public void StoreUser(User user)
    {
        var currentStorage = GetStorageUsers();
        List<StorageUser> newStorageUsers = new List<StorageUser>() { };
        if (currentStorage != "" && currentStorage != "[]")
        {
            newStorageUsers = JsonConvert.DeserializeObject<List<StorageUser>>(currentStorage);
        }
        var storageUser = new StorageUser()
        {
            Infos = user,
            CreationDate = Helper.DateFormatter.NowDateTime()
            ...
        };
        newStorageUsers.Add(storageUser);

        var content = JsonConvert.SerializeObject(
                            newStorageUsers,
                            Formatting.None,
                            new JsonSerializerSettings()
                            {
                                ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                            });

        _store(newStorageUsers, content);
    }

    private void _store(List<StorageUser> newStorageUser, string content)
    {
        // breakpoint can't be triggered there because app shut down with logs
        File.WriteAllText(_usersPathFile, content);
    }
 }

public void StoreUser(User user)
{
    var currentStorage = GetStorageUsers();
    List<StorageUser> newStorageUsers = new List<StorageUser>() { };
    if (currentStorage != "" && currentStorage != "[]")
    {
        newStorageUsers = JsonConvert.DeserializeObject<List<StorageUser>>(currentStorage);
    }
    var storageUser = new StorageUser()
    {
        Infos = user,
        CreationDate = Helper.DateFormatter.NowDateTime()
        ...
    };
    newStorageUsers.Add(storageUser);

    var content = JsonConvert.SerializeObject(
                        newStorageUsers,
                        Formatting.None,
                        new JsonSerializerSettings()
                        {
                            ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                        });

    _store(newStorageUsers, content);
}

private void _store(List<StorageUser> newStorageUser, string content)
{
    // breakpoint can't be triggered there because app shut down with logs
    File.WriteAllText(_usersPathFile, content);
}

}

This service is used on several pages but I got this bug in only one page

After this message on logs :

Explicit concurrent copying GC freed 7041(512KB) AllocSpace objects, 2(264KB) LOS objects, 49% free, 4343KB/8687KB, paused 187us total 28.412ms

I got

Pending exception java.lang.StackOverflowError: stack size 8192KB ...

JNI DETECTED ERROR IN APPLICATION: JNI IsInstanceOf called with pending exception java.lang.StackOverflowError: stack size 8192KB ...

Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 8815 (om.myapp.app), pid 8815

've no more details of what happened and why, how can I fix this please?