#vulnerable code 
                              @Override
  public void transitionInto(RunState state) {
    switch (state.state()) {
      case SUBMITTING:
        try {
          final String executionId = dockerRunnerStart(state);
          // this is racy
          final Event submitted = Event.submitted(state.workflowInstance(), executionId);
          try {
            stateManager.receive(submitted);
          } catch (StateManager.IsClosed isClosed) {
            LOG.warn("Could not send 'created' event", isClosed);
          }
        } catch (Exception e) {
          LOG.warn("Failed the docker starting procedure for " + state.workflowInstance().toKey(), e);
          stateManager.receiveIgnoreClosed(Event.halt(state.workflowInstance()));
        }
        break;

      case TERMINATED:
      case FAILED:
      case ERROR:
        if (state.executionId().isPresent()) {
          final String executionId = state.executionId().get();
          LOG.info("Cleaning up {} pod: {}", state.workflowInstance().toKey(), executionId);

          dockerRunner.cleanup(executionId);
        }
        break;

      default:
        // do nothing
    }
  } 
                            #location 15 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              @Override
  public void transitionInto(RunState state) {
    switch (state.state()) {
      case SUBMITTING:
        try {
          final String executionId = dockerRunnerStart(state);
          // this is racy
          final Event submitted = Event.submitted(state.workflowInstance(), executionId);
          try {
            stateManager.receive(submitted);
          } catch (StateManager.IsClosed isClosed) {
            LOG.warn("Could not send 'created' event", isClosed);
          }
        } catch (ResourceNotFoundException e) {
          LOG.error("Unable to start docker procedure.", e);
          stateManager.receiveIgnoreClosed(Event.halt(state.workflowInstance()));
        } catch (IOException e) {
          try {
            LOG.error("Failed the docker starting procedure for " + state.workflowInstance().toKey(), e);
            stateManager.receive(Event.runError(state.workflowInstance(), e.getMessage()));
          } catch (StateManager.IsClosed isClosed) {
            LOG.warn("Failed to send 'runError' event", isClosed);
          }
        }
        break;

      case TERMINATED:
      case FAILED:
      case ERROR:
        if (state.executionId().isPresent()) {
          final String executionId = state.executionId().get();
          LOG.info("Cleaning up {} pod: {}", state.workflowInstance().toKey(), executionId);

          dockerRunner.cleanup(executionId);
        }
        break;

      default:
        // do nothing
    }
  }