except ValidationError as e:
        logger.warning(f"Invalid vulnerability reference: {reference!r}: {e}")

except ValidationError as e:
        error_message = str(e)
        if "Vulnerability reference with this Url already exists." in error_message:
            logger.debug(f"Duplicate vulnerability reference ignored: {reference!r}")
        else:
            logger.warning(f"Invalid vulnerability reference: {reference!r}: {e}")