abstract contract LSP14Ownable2Step is ... {

    function _renounceOwnership() ...  {
        ...
        if (currentBlock > confirmationPeriodEnd || _renounceOwnershipStartedAt == 0 ) {
            _renounceOwnershipStartedAt = currentBlock;
            delete _pendingOwner;
            ...
            return;
        }
        ...
    }
}
