Foreach loop duplicating last item {solved}

<?php
// [[orderDetailsInToSESSION]]

if ( empty($_GET['customer']) ) return "no customer account specified";
else {
    // sanitize and validate the input type
    $customer = $modx->db->escape($_GET['customer']);
    $orderId = $modx->db->escape($_GET['orderId']);
    // get the details from the orderId
    $db_query = $modx->db->select("productId, quantity", $modx->getFullTableName('customer_order_details'), "orderId='" . $orderId . "'");
    if ($modx->db->getRecordCount($db_query) > 0) {
        while ($row = $modx->db->getRow($db_query)) {
            // get the current prices and names of the products previously ordered
            $document_tvs = $modx->getTemplateVars(array("pagetitle", "price", "specialPrice"), "name", $row['productId']);

         // put the returned array into a simpler/easier to use array
               if (is_array($document_tvs)) {  
               foreach( $document_tvs as &$document_TV) {
                $docTVArray[$document_TV['name']] = $document_TV['value'];
               }
                unset($document_TV);
              }

          // put these details into the session
         $_SESSION['shoppingCartContents'][] = Array (
              'productId' => $row['productId'],
             'productTitle' => $docTVArray['pagetitle'],
              'price' => ( !empty( $docTVArray['specialPrice']) ) ?  $docTVArray['specialPrice'] :  $docTVArray['price'],
              'quantity' => $row['quantity']
          );
        }
    }
 }
?>