output: #fixed code
                               @EventHandler
  	public void onStructureGrow(StructureGrowEvent event) {
  		Location location = event.getLocation();
  		GWorld world = gw.getTableManager().getWorldTable().getWorld(location.getWorld().getName());
  		TreeTable treeTable = gw.getTableManager().getTreeTable();
  		GPlayer planter;
  
  		// TODO: Add TreeType species to reduction model
  
  		if (treeTable.getLocationMap().containsKey(location)) {
  			Tree tree = treeTable.getTreeMap().get(treeTable.getLocationMap().get(location));
  			planter = tree.getOwner();
  
  			Reduction reduction = ClimateEngine.getInstance().getClimateEngine(world.getWorldName()).treeGrow(planter, event.getSpecies(), event.getBlocks());
  			int carbonScore = planter.getCarbonScore();
  			planter.setCarbonScore((int) (carbonScore - reduction.getReductionValue()));
  
  			tree.setSapling(false);
  			tree.setSize(event.getBlocks().size()); // TODO: Only consider core species blocks as tree size
  
  			// Queue tree update query
  			TreeUpdateQuery treeUpdateQuery = new TreeUpdateQuery(tree);
  			AsyncDBQueue.getInstance().queueUpdateQuery(treeUpdateQuery);
  		} else {
  			PlayerTable playerTable = GlobalWarming.getInstance().getTableManager().getPlayerTable();
  			planter = playerTable.getOrCreatePlayer(untrackedUUID, true);
  
  			// First create a new tree object and store it
  			Long uniqueId = GlobalWarming.getInstance().getRandom().nextLong();
  			// TODO: Only consider core species blocks as tree size
  			Tree tree = new Tree(uniqueId, planter, location, false, event.getBlocks().size());
  
  			TreeInsertQuery insertQuery = new TreeInsertQuery(tree);
  			AsyncDBQueue.getInstance().queueInsertQuery(insertQuery);
  
  			gw.getLogger().warning("Untracked structure grow occured:");
  			gw.getLogger().warning("@ " + location.toString());
  		}
  
  		// Create a new reduction object using the worlds climate engine
  		Reduction reduction = ClimateEngine.getInstance().getClimateEngine(world.getWorldName()).treeGrow(planter, event.getSpecies(), event.getBlocks());
  		int carbonScore = planter.getCarbonScore();
  		planter.setCarbonScore((int) (carbonScore - reduction.getReductionValue()));
  
  		// Queue player update query
  		PlayerUpdateQuery playerUpdateQuery = new PlayerUpdateQuery(planter);
  		AsyncDBQueue.getInstance().queueUpdateQuery(playerUpdateQuery);
  
  		// Queue reduction insert query
  		ReductionInsertQuery insertQuery = new ReductionInsertQuery(reduction);
  		AsyncDBQueue.getInstance().queueInsertQuery(insertQuery);
  	}
input: #vulnerable code 
                               @EventHandler
  	public void onStructureGrow(StructureGrowEvent event) {
  		Location location = event.getLocation();
  		GWorld world = gw.getTableManager().getWorldTable().getWorld(location.getWorld().getName());
  		TreeTable treeTable = gw.getTableManager().getTreeTable();
  
  		if (treeTable.getLocationMap().containsKey(location)) {
  			Long uuid = treeTable.getLocationMap().get(location);
  			Tree tree = treeTable.getTreeMap().get(uuid);
  			UUID ownerUUID = tree.getOwner().getUuid();
  			GPlayer planter = gw.getTableManager().getPlayerTable().getPlayers().get(ownerUUID);
  			Reduction reduction = ClimateEngine.getInstance().getClimateEngine(world.getWorldName()).treeGrow(planter, event.getSpecies(), event.getBlocks());
  			int carbonScore = planter.getCarbonScore();
  			planter.setCarbonScore((int) (carbonScore - reduction.getReductionValue())); 
  
  			tree.setSapling(false);
  
  			// TODO: Queue tree DB update
  			// TODO: Queue planter score DB update
  			// TODO: Queue new reduction DB insert
  		} else {
  			gw.getLogger().severe("Untracked structure grow occured:");
  			gw.getLogger().severe("@ " + location.toString());
  		}
  	} 
                              #location 12 
                              #vulnerability type NULL_DEREFERENCE