#fixed code
                                public void replyToStatus(String content, String replyTo) throws ArchivedGroupException, ReplyStatusException {
        AbstractStatus abstractStatus = statusRepository.findStatusById(replyTo);
        if (abstractStatus != null &&
                !abstractStatus.getType().equals(StatusType.STATUS) &&
                !abstractStatus.getType().equals(StatusType.SHARE)) {

            log.debug("Can not reply to a status of this type");
            throw new ReplyStatusException();
        }
        if (abstractStatus != null &&
                abstractStatus.getType().equals(StatusType.SHARE)) {

            log.debug("Replacing the share by the original status");
            Share share = (Share) abstractStatus;
            AbstractStatus abstractRealStatus = statusRepository.findStatusById(share.getOriginalStatusId());
            abstractStatus = abstractRealStatus;
        }

        Status status = (Status) abstractStatus;
        Group group = null;
        if (status.getGroupId() != null) {
            group = groupService.getGroupById(status.getDomain(), status.getGroupId());

            if (group.isArchivedGroup()) {
                throw new ArchivedGroupException();
            }
        }
        if (!status.getReplyTo().equals("")) {
            log.debug("Replacing the status by the status at the origin of the disucssion");
            // Original status is also a reply, replying to the real original status instead
            AbstractStatus abstractRealOriginalStatus = statusRepository.findStatusById(status.getDiscussionId());
            if (abstractRealOriginalStatus == null ||
                    !abstractRealOriginalStatus.getType().equals(StatusType.STATUS)) {

                throw new ReplyStatusException();
            }
            Status realOriginalStatus = (Status) abstractRealOriginalStatus;

            Status replyStatus = createStatus(
                    content,
                    realOriginalStatus.getStatusPrivate(),
                    group,
                    realOriginalStatus.getStatusId(),
                    status.getStatusId(),
                    status.getUsername());

            discussionRepository.addReplyToDiscussion(realOriginalStatus.getStatusId(), replyStatus.getStatusId());
        } else {
            log.debug("Replying directly to the status at the origin of the disucssion");
            // The original status of the discussion is the one we reply to
            Status replyStatus =
                    createStatus(content,
                            status.getStatusPrivate(),
                            group,
                            status.getStatusId(),
                            status.getStatusId(),
                            status.getUsername());

            discussionRepository.addReplyToDiscussion(status.getStatusId(), replyStatus.getStatusId());
        }
    }
#vulnerable code 
                                public void replyToStatus(String content, String replyTo) throws ArchivedGroupException, ReplyStatusException {
        AbstractStatus abstractOriginalStatus = statusRepository.findStatusById(replyTo);
        if (abstractOriginalStatus != null &&
                !abstractOriginalStatus.getType().equals(StatusType.STATUS) &&
                !abstractOriginalStatus.getType().equals(StatusType.SHARE)) {

            log.debug("Can not reply to a status of this type");
            throw new ReplyStatusException();
        }
        if (abstractOriginalStatus != null &&
                abstractOriginalStatus.getType().equals(StatusType.SHARE)) {

            Share share = (Share) abstractOriginalStatus;
            AbstractStatus abstractRealOriginalStatus = statusRepository.findStatusById(share.getOriginalStatusId());
            abstractOriginalStatus = abstractRealOriginalStatus;
        }

        Status originalStatus = (Status) abstractOriginalStatus;
        Group group = null;
        if (originalStatus.getGroupId() != null) {
            group = groupService.getGroupById(originalStatus.getDomain(), originalStatus.getGroupId());

            if (group.isArchivedGroup()) {
                throw new ArchivedGroupException();
            }
        }
        if (!originalStatus.getReplyTo().equals("")) {
            // Original status is also a reply, replying to the real original status instead
            AbstractStatus abstractRealOriginalStatus = statusRepository.findStatusById(originalStatus.getDiscussionId());
            if (abstractRealOriginalStatus == null ||
                    !abstractRealOriginalStatus.getType().equals(StatusType.STATUS)) {

                throw new ReplyStatusException();
            }
            Status realOriginalStatus = (Status) abstractRealOriginalStatus;

            Status replyStatus = createStatus(
                    content,
                    realOriginalStatus.getStatusPrivate(),
                    group,
                    realOriginalStatus.getStatusId(),
                    originalStatus.getStatusId(),
                    originalStatus.getUsername());

            discussionRepository.addReplyToDiscussion(realOriginalStatus.getStatusId(), replyStatus.getStatusId());
        } else {
            // The original status of the discussion is the one we reply to
            Status replyStatus =
                    createStatus(content,
                            originalStatus.getStatusPrivate(),
                            group,
                            replyTo,
                            replyTo,
                            originalStatus.getUsername());

            discussionRepository.addReplyToDiscussion(originalStatus.getStatusId(), replyStatus.getStatusId());
        }
    } 
                            #location 20 
                            #vulnerability type NULL_DEREFERENCE