Помогите убрать Undefined index: и другие ошибки.

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Таких ошибок по 50мб в час набегает в файл error.php

 

2018-09-17 11:04:26 - PHP Notice:  Undefined index: free in /home/.../vqmod/vqcache/vq2-catalog_controller_product_category.php on line 340 

 

2018-09-17 11:04:26 - PHP Notice:  Uninitialized string offset: 0 in /home/.../catalog/model/shipping/xshipping.php on line 16

2018-09-17 11:04:26 - PHP Warning:  Illegal string offset 'country_id' in /home/.../catalog/model/shipping/xshipping.php on line 16

2018-09-17 11:04:26 - PHP Notice:  Uninitialized string offset: 0 in /home/.../catalog/model/shipping/xshipping.php on line 16

2018-09-17 11:04:26 - PHP Warning:  Illegal string offset 'zone_id' in /home/.../catalog/model/shipping/xshipping.php on line 16

2018-09-17 11:04:26 - PHP Notice:  Uninitialized string offset: 0 in /home/.../catalog/model/shipping/xshipping.php on line 16

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 vq2-catalog_controller_product_category.php

                   if(current($item['quote'])['free']){
                        $price_delivery = ((int)$price_product > (int)current($item['quote'])['free']) ? 0 : current($item['quote'])['cost'];

                    }else{
                        $price_delivery = current($item['quote'])['cost'];

 

xshipping.php

               $query = $this->db->query("SELECT * FROM " . DB_PREFIX . "zone_to_geo_zone WHERE geo_zone_id = '" . (int)$this->config->get('xshipping_geo_zone_id'.$i) . "' AND country_id = '" . (int)$address['country_id'] . "' AND (zone_id = '" . (int)$address['zone_id'] . "' OR zone_id = '0')");

 

 

2018-09-17 10:28:47 - PHP Warning:  Illegal string offset 'country_id' in /home/.../catalog/model/shipping/flat.php on line 6
2018-09-17 10:28:47 - PHP Notice:  Uninitialized string offset: 0 in /home/.../catalog/model/shipping/flat.php on line 6
2018-09-17 10:28:47 - PHP Warning:  Illegal string offset 'zone_id' in /home/.../catalog/model/shipping/flat.php on line 6
2018-09-17 10:28:47 - PHP Notice:  Uninitialized string offset: 0 in /home/.../catalog/model/shipping/flat.php on line 6 

 

flat.php

        $query = $this->db->query("SELECT * FROM " . DB_PREFIX . "zone_to_geo_zone WHERE geo_zone_id = '" . (int)$this->config->get('flat_geo_zone_id') . "' AND country_id = '" . (int)$address['country_id'] . "' AND (zone_id = '" . (int)$address['zone_id'] . "' OR zone_id = '0')");