#vulnerable code 
                                public void execute(JobExecutionContext context) throws JobExecutionException {
        Thread.currentThread().setPriority(Thread.MIN_PRIORITY);

        while(CodeIndexer.shouldPauseAdding()) {
            Singleton.getLogger().info("Pausing parser.");
            return;
        }

        // Pull the next repo to index from the queue
        UniqueRepoQueue repoQueue = this.getNextQueuedRepo();

        RepoResult repoResult = repoQueue.poll();
        AbstractMap<String, Integer> runningIndexRepoJobs = Singleton.getRunningIndexRepoJobs();

        if (repoResult != null && !runningIndexRepoJobs.containsKey(repoResult.getName())) {
            Singleton.getLogger().info("Indexing " + repoResult.getName());
            try {
                runningIndexRepoJobs.put(repoResult.getName(), (int) (System.currentTimeMillis() / 1000));

                JobDataMap data = context.getJobDetail().getJobDataMap();

                String repoName = repoResult.getName();
                String repoRemoteLocation = repoResult.getUrl();
                String repoUserName = repoResult.getUsername();
                String repoPassword = repoResult.getPassword();
                String repoBranch = repoResult.getBranch();

                String repoLocations = data.get("REPOLOCATIONS").toString();
                this.LOWMEMORY = Boolean.parseBoolean(data.get("LOWMEMORY").toString());

                // Check if sucessfully cloned, and if not delete and restart
                boolean cloneSucess = checkCloneUpdateSucess(repoLocations + repoName);
                if (cloneSucess == false) {
                    // Delete the folder and delete from the index
                    try {
                        FileUtils.deleteDirectory(new File(repoLocations + "/" + repoName + "/"));
                        CodeIndexer.deleteByReponame(repoName);
                    } catch (IOException ex) {
                        Singleton.getLogger().warning("ERROR - caught a " + ex.getClass() + " in " + this.getClass() + "\n with message: " + ex.getMessage());
                    }
                }
                deleteCloneUpdateSuccess(repoLocations + "/" + repoName);

                String repoGitLocation = repoLocations + "/" + repoName + "/.git/";

                File f = new File(repoGitLocation);
                boolean existingRepo = f.exists();
                boolean useCredentials = repoUserName != null && !repoUserName.isEmpty();
                RepositoryChanged repositoryChanged = null;

                if (existingRepo) {
                    repositoryChanged = this.updateExistingRepository(repoName, repoRemoteLocation, repoUserName, repoPassword, repoLocations, repoBranch, useCredentials);
                } else {
                    repositoryChanged = this.getNewRepository(repoName, repoRemoteLocation, repoUserName, repoPassword, repoLocations, repoBranch, useCredentials);
                }

                // Write file indicating we have sucessfully cloned
                createCloneUpdateSuccess(repoLocations + "/" + repoName);
                // If the last index was not sucessful, then trigger full index
                boolean indexsuccess = checkIndexSucess(repoGitLocation);

                if (repositoryChanged.isChanged() || indexsuccess == false) {
                    Singleton.getLogger().info("Update found indexing " + repoRemoteLocation);
                    this.updateIndex(repoName, repoLocations, repoRemoteLocation, existingRepo, repositoryChanged);
                }
            }
            finally {
                // Clean up the job
                runningIndexRepoJobs.remove(repoResult.getName());
            }
        }
    } 
                            #location 12 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public void execute(JobExecutionContext context) throws JobExecutionException {
        if (isEnabled() == false) {
            return;
        }


        Thread.currentThread().setPriority(Thread.MIN_PRIORITY);

        while(CodeIndexer.shouldPauseAdding()) {
            Singleton.getLogger().info("Pausing parser.");
            return;
        }

        // Pull the next repo to index from the queue
        UniqueRepoQueue repoQueue = this.getNextQueuedRepo();

        RepoResult repoResult = repoQueue.poll();
        AbstractMap<String, Integer> runningIndexRepoJobs = Singleton.getRunningIndexRepoJobs();

        if (repoResult != null && !runningIndexRepoJobs.containsKey(repoResult.getName())) {
            Singleton.getLogger().info("Indexing " + repoResult.getName());
            try {
                runningIndexRepoJobs.put(repoResult.getName(), (int) (System.currentTimeMillis() / 1000));

                JobDataMap data = context.getJobDetail().getJobDataMap();

                String repoName = repoResult.getName();
                String repoRemoteLocation = repoResult.getUrl();
                String repoUserName = repoResult.getUsername();
                String repoPassword = repoResult.getPassword();
                String repoBranch = repoResult.getBranch();

                String repoLocations = data.get("REPOLOCATIONS").toString();
                this.LOWMEMORY = Boolean.parseBoolean(data.get("LOWMEMORY").toString());

                // Check if sucessfully cloned, and if not delete and restart
                boolean cloneSucess = checkCloneUpdateSucess(repoLocations + repoName);
                if (cloneSucess == false) {
                    // Delete the folder and delete from the index
                    try {
                        FileUtils.deleteDirectory(new File(repoLocations + "/" + repoName + "/"));
                        CodeIndexer.deleteByReponame(repoName);
                    } catch (IOException ex) {
                        Singleton.getLogger().warning("ERROR - caught a " + ex.getClass() + " in " + this.getClass() + "\n with message: " + ex.getMessage());
                    }
                }
                deleteCloneUpdateSuccess(repoLocations + "/" + repoName);

                String repoGitLocation = repoLocations + "/" + repoName + "/.git/";

                File f = new File(repoGitLocation);
                boolean existingRepo = f.exists();
                boolean useCredentials = repoUserName != null && !repoUserName.isEmpty();
                RepositoryChanged repositoryChanged = null;

                if (existingRepo) {
                    repositoryChanged = this.updateExistingRepository(repoName, repoRemoteLocation, repoUserName, repoPassword, repoLocations, repoBranch, useCredentials);
                } else {
                    repositoryChanged = this.getNewRepository(repoName, repoRemoteLocation, repoUserName, repoPassword, repoLocations, repoBranch, useCredentials);
                }

                // Write file indicating we have sucessfully cloned
                createCloneUpdateSuccess(repoLocations + "/" + repoName);
                // If the last index was not sucessful, then trigger full index
                boolean indexsuccess = checkIndexSucess(repoGitLocation);

                if (repositoryChanged.isChanged() || indexsuccess == false) {
                    Singleton.getLogger().info("Update found indexing " + repoRemoteLocation);
                    this.updateIndex(repoName, repoLocations, repoRemoteLocation, existingRepo, repositoryChanged);
                }
            }
            finally {
                // Clean up the job
                runningIndexRepoJobs.remove(repoResult.getName());
            }
        }
    }