Notice : Undefined index: line_item_id in commerce_registration_form_commerce_order_ui_order_form_alter()

Hi,
When adding a new order via admin/commerce/orders/add, clicking on "Add an order" throw an EntityMetadataWrapperException.
Reporting to watchdog, the issue is related to commerce_registration_form_commerce_order_ui_order_form_alter, where $data['line_item_id'] is not defined.
I did this to make it working:

foreach ($form_state['values']['commerce_line_items'] as $lang => $items) {
      foreach ($items as $index => $data) {
        $line_item = commerce_line_item_load((int) $data['line_item_id']);
        $line_item_wrapper = entity_metadata_wrapper('commerce_line_item', $line_item);
        if ($line_item_wrapper->type->value() != 'product') {
          continue;
        }
        $product_id = $line_item_wrapper->commerce_product->product_id->value();
        if (in_array($product_id, array_keys($products))) {
          $products[$product_id]++;
        }
        else {
          $products[$product_id] = 1;
        }
      }
    }

replaced by:

foreach ($form_state['values']['commerce_line_items'] as $lang => $items) {
      foreach ($items as $index => $data) {
        if (isset($data['line_item_id'])) {
          $line_item = commerce_line_item_load((int) $data['line_item_id']);
          $line_item_wrapper = entity_metadata_wrapper('commerce_line_item', $line_item);
          if ($line_item_wrapper->type->value() != 'product') {
            continue;
          }
          $product_id = $line_item_wrapper->commerce_product->product_id->value();
          if (in_array($product_id, array_keys($products))) {
            $products[$product_id]++;
          }
          else {
            $products[$product_id] = 1;
          }
        }
      }
    }