Add product - failed error (not a ProInvoice module issue!)

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<b>Notice</b>: Undefined index:  value in <b>xxx\upload\manage\model\sale\order.php</b> on line <b>85</b>...

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- PHP Notice:  Undefined index:  description in D:\weblocal\www\Tests\e-commerce\opencart_v1.4.9.3_eng\upload\admin\model\sale\order.php on line 69

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// TU START
      $query = $this->db->query("SELECT order_total_id, value FROM " . DB_PREFIX . "order_total WHERE sort_order = '" . (int)$data['tax']['sort_order'] . "' AND order_id = '" . (int)$order_id . "' LIMIT 1");
      $tax_value = $query->row;

      if($tax_value) {
         $new_value = $tax_value['value'] + ($data['tax']['rate'] / 100) * $data['price'] * $data['quantity'];
         $this->db->query("UPDATE " . DB_PREFIX . "order_total SET text = '" . $this->db->escape($this->currency->format($new_value, $data['currency'], $data['currency_value'], true)) . "', value = '" . (float)$this->currency->format($new_value, $data['currency'], $data['currency_value'], false) . "' WHERE order_total_id = '" . $tax_value['order_total_id'] . "'");
      } else {
         $new_value = ($data['tax']['rate'] / 100) * $data['price'] * $data['quantity'];
         $this->db->query("INSERT INTO " . DB_PREFIX . "order_total (order_id, title, text, value, sort_order) VALUES ('" . (int)$order_id . "', '" . $this->db->escape($data['tax']['description'] . ':') . "', '" . $this->db->escape($this->currency->format($new_value, $data['currency'], $data['currency_value'], true)) . "', '" . (float)$this->currency->format($new_value, $data['currency'], $data['currency_value'], false) . "', '" . (int)$data['tax']['sort_order'] . "')");
      } 
// TU END

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$this->cart->add($order_product['product_id'], $order_product['quantity'], $option_data);

$this->cart->add($this->request->post['product_id'], $quantity, $option);

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$this->cart->add($order_product['product_id'], $order_product['quantity'], $option_data, '');

$this->cart->add($this->request->post['product_id'], $quantity, $option, '');