My users function using hasManyThrough not work correctly

[gutyerrez]

That's say's this error:

My code:

    public function users()
    {
        return $this->hasManyThrough(
            'App\Models\User',
            'App\Models\UserGroupDue',
            'user_id',
            'id',
            'name',
            'group_name'
        );
    }

[gutyerrez]

I solved this problem adding public $keyType = 'string'; in my Group model.