NullPointer on Interact

I've been trying to use the PlayerInteractEvent to get if they interacted with a button at the correct coordinates. However, I use Block b = event.getClickedBlock() and then later NPEs I use b.getBLAH and it returns NPE so I'm assuming it thinks that the block that I'm interacting with is null... And it does it whenever I interact with anything, even throwing potions.....

Code (open) Code (close)

Code:java

    @EventHandler
    public void onInteract(PlayerInteractEvent event){
        Block b = event.getClickedBlock();
        Player p = event.getPlayer();
        String pname = p.getName();
        //TODO Button location
        Location l = new Location(getServer().getWorld("Games"), -770, 5, -914);
        if(b.getLocation()== l){
            if(b.getTypeId()== 143 || b.getTypeId()== 77){
                if(!players.contains(pname)){
                    if(!inGame){
                        players.add(pname);
                        getServer().broadcastMessage(ChatColor.GOLD + "[SnowBall] " + ChatColor.AQUA + pname + ChatColor.GREEN + " Joined the snowball fight, game starts in " + ChatColor.LIGHT_PURPLE + i + ChatColor.GREEN + " seconds!");
                        if(players.size()>= 2){
                            isStarting = true;
                            if(!isStarting){
                                i = 60;
                                scheduler = getServer().getScheduler().scheduleAsyncRepeatingTask(this, new Runnable(){
                                    public void run(){
                                        if(i==45){
                                            getServer().broadcastMessage(ChatColor.GOLD + "[SnowBall] " + ChatColor.GREEN + String.valueOf(i) + ChatColor.AQUA + " seconds till the game starts!");
                                        }else if(i== 30){
                                            getServer().broadcastMessage(ChatColor.GOLD + "[SnowBall] " + ChatColor.GREEN + String.valueOf(i) + ChatColor.AQUA + " seconds till the game starts!");
                                        }else if(i== 15){
                                            getServer().broadcastMessage(ChatColor.GOLD + "[SnowBall] " + ChatColor.GREEN + String.valueOf(i) + ChatColor.AQUA + " seconds till the game starts!");
                                        }else if(i< 10 && i!= 0){
                                            getServer().broadcastMessage(ChatColor.GOLD + "[SnowBall] " + ChatColor.GREEN + String.valueOf(i) + ChatColor.AQUA + " seconds till the game starts!");
                                        }else if(i== 0){
                                            startGames();
                                            getServer().getScheduler().cancelTask(scheduler);
                                        }
                                        i = i-1;
                                    }
                                }, 20L, 20L);
                            }
                        }
                    }else{
                        p.sendMessage(ChatColor.GOLD + "[SnowBall] " + ChatColor.RED + "The game is in progress, it will be done in: " + ChatColor.BLUE + left/60 + " mins!");
                    }
                }
            }
        }
    }

 

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Check that the action is interacting with a block before you try and get the block, or you'll get errors like the ones you're experiencing.