[PrestaShopException]

Property Cart->id_currency is empty
at line 872 in file classes/ObjectModel.php

867. 
868. 			$message = $this->validateField($field, $this->$field);
869. 			if ($message !== true)
870. 			{
871. 				if ($die)
872. 					throw new PrestaShopException($message);
873. 				return $error_return ? $message : false;
874. 			}
875. 		}
876. 
877. 		return true;