output: #fixed code
                                  @Override
      public void execute() throws MojoExecutionException, MojoFailureException {
          try {
              // check uncommitted changes
              checkUncommittedChanges();
  
              // git for-each-ref --format='%(refname:short)' refs/heads/hotfix/*
              final String hotfixBranches = gitFindBranches(gitFlowConfig
                      .getHotfixBranchPrefix());
  
              if (StringUtils.isBlank(hotfixBranches)) {
                  throw new MojoFailureException("There is no hotfix branches.");
              }
  
              String[] branches = hotfixBranches.split("\\r?\\n");
  
              List<String> numberedList = new ArrayList<String>();
              StringBuilder str = new StringBuilder("Hotfix branches:")
                      .append(LS);
              for (int i = 0; i < branches.length; i++) {
                  str.append((i + 1) + ". " + branches[i] + LS);
                  numberedList.add(String.valueOf(i + 1));
              }
              str.append("Choose hotfix branch to finish");
  
              String hotfixNumber = null;
              try {
                  while (StringUtils.isBlank(hotfixNumber)) {
                      hotfixNumber = prompter
                              .prompt(str.toString(), numberedList);
                  }
              } catch (PrompterException e) {
                  getLog().error(e);
              }
  
              String hotfixBranchName = null;
              if (hotfixNumber != null) {
                  int num = Integer.parseInt(hotfixNumber);
                  hotfixBranchName = branches[num - 1];
              }
  
              if (StringUtils.isBlank(hotfixBranchName)) {
                  throw new MojoFailureException(
                          "Hotfix name to finish is blank.");
              }
  
              // git checkout hotfix/...
              gitCheckout(hotfixBranchName);
  
              if (!skipTestProject) {
                  // mvn clean test
                  mvnCleanTest();
              }
  
              // git checkout master
              gitCheckout(gitFlowConfig.getProductionBranch());
  
              // git merge --no-ff hotfix/...
              gitMergeNoff(hotfixBranchName);
  
              if (!skipTag) {
                  String tagVersion = getCurrentProjectVersion();
                  if (tychoBuild && ArtifactUtils.isSnapshot(tagVersion)) {
                      tagVersion = tagVersion.replace("-"
                              + Artifact.SNAPSHOT_VERSION, "");
                  }
  
                  // git tag -a ...
                  gitTag(gitFlowConfig.getVersionTagPrefix() + tagVersion,
                          "tagging hotfix");
              }
  
              // check whether release branch exists
              // git for-each-ref --count=1 --format="%(refname:short)"
              // refs/heads/release/*
              final String releaseBranch = executeGitCommandReturn(
                      "for-each-ref", "--count=1",
                      "--format=\"%(refname:short)\"", "refs/heads/"
                              + gitFlowConfig.getReleaseBranchPrefix() + "*");
  
              // if release branch exists merge hotfix changes into it
              if (StringUtils.isNotBlank(releaseBranch)) {
                  // git checkout release
                  gitCheckout(releaseBranch);
                  // git merge --no-ff hotfix/...
                  gitMergeNoff(hotfixBranchName);
              } else {
                  // git checkout develop
                  gitCheckout(gitFlowConfig.getDevelopmentBranch());
  
                  // git merge --no-ff hotfix/...
                  gitMergeNoff(hotfixBranchName);
  
                  // get current project version from pom
                  final String currentVersion = getCurrentProjectVersion();
  
                  String nextSnapshotVersion = null;
                  // get next snapshot version
                  try {
                      final DefaultVersionInfo versionInfo = new DefaultVersionInfo(
                              currentVersion);
                      nextSnapshotVersion = versionInfo.getNextVersion()
                              .getSnapshotVersionString();
                  } catch (VersionParseException e) {
                      if (getLog().isDebugEnabled()) {
                          getLog().debug(e);
                      }
                  }
  
                  if (StringUtils.isBlank(nextSnapshotVersion)) {
                      throw new MojoFailureException(
                              "Next snapshot version is blank.");
                  }
  
                  // mvn versions:set -DnewVersion=... -DgenerateBackupPoms=false
                  mvnSetVersions(nextSnapshotVersion);
  
                  // git commit -a -m updating for next development version
                  gitCommit("updating for next development version");
              }
  
              if (installProject) {
                  // mvn clean install
                  mvnCleanInstall();
              }
  
              if (!keepBranch) {
                  // git branch -d hotfix/...
                  gitBranchDelete(hotfixBranchName);
              }
          } catch (CommandLineException e) {
              getLog().error(e);
          }
      }
input: #vulnerable code 
                                  @Override
      public void execute() throws MojoExecutionException, MojoFailureException {
          try {
              // check uncommitted changes
              checkUncommittedChanges();
  
              // git for-each-ref --format='%(refname:short)' refs/heads/hotfix/*
              final String hotfixBranches = gitFindBranches(gitFlowConfig
                      .getHotfixBranchPrefix());
  
              if (StringUtils.isBlank(hotfixBranches)) {
                  throw new MojoFailureException("There is no hotfix branches.");
              }
  
              String[] branches = hotfixBranches.split("\\r?\\n");
  
              List<String> numberedList = new ArrayList<String>();
              StringBuilder str = new StringBuilder("Hotfix branches:")
                      .append(LS);
              for (int i = 0; i < branches.length; i++) {
                  str.append((i + 1) + ". " + branches[i] + LS);
                  numberedList.add(String.valueOf(i + 1));
              }
              str.append("Choose hotfix branch to finish");
  
              String hotfixNumber = null;
              try {
                  while (StringUtils.isBlank(hotfixNumber)) {
                      hotfixNumber = prompter
                              .prompt(str.toString(), numberedList);
                  }
              } catch (PrompterException e) {
                  getLog().error(e);
              }
  
              String hotfixBranchName = null;
              if (hotfixNumber != null) {
                  int num = Integer.parseInt(hotfixNumber);
                  hotfixBranchName = branches[num - 1];
              }
  
              if (StringUtils.isBlank(hotfixBranchName)) {
                  throw new MojoFailureException(
                          "Hotfix name to finish is blank.");
              }
  
              // git checkout hotfix/...
              gitCheckout(hotfixBranchName);
  
              if (!skipTestProject) {
                  // mvn clean test
                  mvnCleanTest();
              }
  
              // git checkout master
              gitCheckout(gitFlowConfig.getProductionBranch());
  
              // git merge --no-ff hotfix/...
              gitMergeNoff(hotfixBranchName);
  
              if (!skipTag) {
                  // git tag -a ...
                  gitTag(gitFlowConfig.getVersionTagPrefix()
                          + hotfixBranchName.replaceFirst(
                                  gitFlowConfig.getHotfixBranchPrefix(), ""),
                          "tagging hotfix");
              }
  
              // check whether release branch exists
              // git for-each-ref --count=1 --format="%(refname:short)"
              // refs/heads/release/*
              final String releaseBranch = executeGitCommandReturn(
                      "for-each-ref", "--count=1",
                      "--format=\"%(refname:short)\"", "refs/heads/"
                              + gitFlowConfig.getReleaseBranchPrefix() + "*");
  
              // if release branch exists merge hotfix changes into it
              if (StringUtils.isNotBlank(releaseBranch)) {
                  // git checkout release
                  gitCheckout(releaseBranch);
                  // git merge --no-ff hotfix/...
                  gitMergeNoff(hotfixBranchName);
              } else {
                  // git checkout develop
                  gitCheckout(gitFlowConfig.getDevelopmentBranch());
  
                  // git merge --no-ff hotfix/...
                  gitMergeNoff(hotfixBranchName);
  
                  // get current project version from pom
                  final String currentVersion = getCurrentProjectVersion();
  
                  String nextSnapshotVersion = null;
                  // get next snapshot version
                  try {
                      final DefaultVersionInfo versionInfo = new DefaultVersionInfo(
                              currentVersion);
                      nextSnapshotVersion = versionInfo.getNextVersion()
                              .getSnapshotVersionString();
                  } catch (VersionParseException e) {
                      if (getLog().isDebugEnabled()) {
                          getLog().debug(e);
                      }
                  }
  
                  if (StringUtils.isBlank(nextSnapshotVersion)) {
                      throw new MojoFailureException(
                              "Next snapshot version is blank.");
                  }
  
                  // mvn versions:set -DnewVersion=... -DgenerateBackupPoms=false
                  mvnSetVersions(nextSnapshotVersion);
  
                  // git commit -a -m updating for next development version
                  gitCommit("updating for next development version");
              }
  
              if (installProject) {
                  // mvn clean install
                  mvnCleanInstall();
              }
  
              if (!keepBranch) {
                  // git branch -d hotfix/...
                  gitBranchDelete(hotfixBranchName);
              }
          } catch (CommandLineException e) {
              getLog().error(e);
          }
      } 
                              #location 64 
                              #vulnerability type NULL_DEREFERENCE