Problem With Sensing Block

Code:javascript

        if(checkFor(Material.PISTON_MOVING_PIECE, p, 1, 1, 1))
        {
            p.sendMessage("§2Player in line? " + p.getMetadata("playerInLine").get(0).asBoolean());
            if(Join.racing)
            {
                if(p.getLocation().getYaw() > -90 && p.getLocation().getYaw() < 90)
                {
                    if(p.hasMetadata("playerLap") && p.hasMetadata("playerInLine"))
                    {
                        if(!p.getMetadata("playerInLine").get(0).asBoolean())
                        {
                        p.setMetadata("playerInLine", new FixedMetadataValue(plugin, true));    
                        int lap = p.getMetadata("playerLap").get(0).asInt();
                        p.setMetadata("lap", null);
                        int newLap = lap + 1;
                        p.sendMessage("§bPlayer lap is now: " + newLap);                
                        }
                        else
                        {
                            p.sendMessage("§6Failed PlayerInLine test.");
                        }
                    }
                    else
                    {
                        p.sendMessage("§5Failed has metadata test.");
                    }
                }
                else
                {
                    p.damage(30.00);
                    p.sendMessage("§4Near piston moving piece! - Wrong way!");
                }
            }            
        }
        else
        {
            p.setMetadata("playerInLine", new FixedMetadataValue(plugin, false));    
        }

^ My code. ^

I'm trying to make it so when a player comes within range of a lap-marker, it checks to see if he's on the finish line and if he hasn't been before, it adds a lap (stored in Metadata), and marks him as on the line so he doesn't get laps added to him every time he moved while on the line. However, I keep getting the "Failed PlayerInLine test" which should be impossible. I set his metadata so I should be getting the message about what the player lap is now once. But I'm not. On player join, his metadata for PlayerInLine is set to false.

Any help is appreciated. Thanks!