output: #fixed code
                                  public void run() {
          if (shutdown) {
              return;
          }
  
          try {
              initialize();
              LOG.info("Initialization complete. Starting worker loop.");
          } catch (RuntimeException e1) {
              LOG.error("Unable to initialize after " + MAX_INITIALIZATION_ATTEMPTS + " attempts. Shutting down.", e1);
              shutdown();
          }
  
          while (!shouldShutdown()) {
              runProcessLoop();
          }
  
          finalShutdown();
          LOG.info("Worker loop is complete. Exiting from worker.");
      }
input: #vulnerable code 
                                  public void run() {
          if (shutdown) {
              return;
          }
  
          try {
              initialize();
              LOG.info("Initialization complete. Starting worker loop.");
          } catch (RuntimeException e1) {
              LOG.error("Unable to initialize after " + MAX_INITIALIZATION_ATTEMPTS + " attempts. Shutting down.", e1);
              shutdown();
          }
  
          while (!shouldShutdown()) {
              try {
                  boolean foundCompletedShard = false;
                  Set<ShardInfo> assignedShards = new HashSet<ShardInfo>();
                  for (ShardInfo shardInfo : getShardInfoForAssignments()) {
                      ShardConsumer shardConsumer = createOrGetShardConsumer(shardInfo, recordProcessorFactory);
                      if (shardConsumer.isShutdown()
                              && shardConsumer.getShutdownReason().equals(ShutdownReason.TERMINATE)) {
                          foundCompletedShard = true;
                      } else {
                          shardConsumer.consumeShard();
                      }
                      assignedShards.add(shardInfo);
                  }
  
                  if (foundCompletedShard) {
                      controlServer.syncShardAndLeaseInfo(null);
                  }
  
                  // clean up shard consumers for unassigned shards
                  cleanupShardConsumers(assignedShards);
  
                  wlog.info("Sleeping ...");
                  Thread.sleep(idleTimeInMilliseconds);
              } catch (Exception e) {
                  LOG.error(String.format("Worker.run caught exception, sleeping for %s milli seconds!",
                          String.valueOf(idleTimeInMilliseconds)),
                          e);
                  try {
                      Thread.sleep(idleTimeInMilliseconds);
                  } catch (InterruptedException ex) {
                      LOG.info("Worker: sleep interrupted after catching exception ", ex);
                  }
              }
              wlog.resetInfoLogging();
          }
  
          finalShutdown();
          LOG.info("Worker loop is complete. Exiting from worker.");
      } 
                              #location 18 
                              #vulnerability type NULL_DEREFERENCE