[PrestaShopException]

Property Cart->id_lang is empty
at line 912 in file classes/ObjectModel.php

907.             }
908. 
909.             $message = $this->validateField($field, $this->$field);
910.             if ($message !== true) {
911.                 if ($die) {
912.                     throw new PrestaShopException($message);
913.                 }
914.                 return $error_return ? $message : false;
915.             }
916.         }
917.