Bank query problem with Codeigniter

Question

I have a table in the bank (use_shopBlock), which locks a button in the view, but when I give a <?php var_dump($shopBlock);?> the result is NULL.

My view:

<?php
             $shopBlock = $this->main_model->configBlock('use_shopBlock');

                  if($shopBlock == 9){
                     echo '
                        <button type="button" id="open-shop" class="btn btn-primary"><i class="fa fa-shopping-cart" aria-hidden="true"></i>Abrir Minha Loja</button>
                     ';
                  }
               ?>

My model:

 public function configBlock($column = false) {
        $this->db->limit(1);

        if ($column) {
            $this->db->select($column);
        }

        $query = $this->db->get('users');
        $query = $query->result();

        if ($query) {
            if ($column) {
                return $query[0]->$column;
            } else {
                return $query[0];
            }
        } else {
            return false;
        }
    }

I will attach how my table was made in MYSQL

When the user registers, adds the value 8 in the shopBlock table, and the administrator, when changed to "Store Released", changes to the value 9.

This value 9, should release the button in the view.

Code that changes value in admin:

<div class="form-group">
                        <label>Ativar loja</label><br>
                            <select class="form-control" name="shopBlock">
                            <option <?=(($e && $item->use_shopBlock == '9') ? 'selected' : '')?> value="9">Loja Liberada</option>
                            <option <?=(($e && $item->use_shopBlock == '8') ? 'selected' : '')?> value="8">Loja Bloqueada</option>
                        </select>
                    </div