Cannot stop error code.

Hi there Bukkit!
I am coding a plugin called Skycraft and i'm getting this error,

Code:java

08:50:08 [SEVERE] Could not pass event PlayerMoveEvent to Skycraft-Main v0.1
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
    at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:227)
    at net.minecraft.server.v1_6_R3.Packet10Flying.handle(SourceFile:136)
    at net.minecraft.server.v1_6_R3.NetworkManager.b(NetworkManager.java:296)
    at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:116)
    at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
    at net.minecraft.server.v1_6_R3.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:592)
    at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
    at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
    at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
    at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NullPointerException
    at me.Twipply.SkyCraft.SkyCraft.onPlayerMove(SkyCraft.java:84)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    ... 14 more

and then the code I am using is

Code:java

@EventHandler
    public void onPlayerMove(PlayerMoveEvent event) {
        Player player = event.getPlayer();
        if(player.getInventory().getBoots().getType() == Material.CHAINMAIL_BOOTS){
            ItemStack boots = player.getInventory().getBoots();
            ItemMeta bootsmeta = boots.getItemMeta();
            bootsmeta.setDisplayName(ChatColor.AQUA + "Angelic Boots");
            boots.setItemMeta(bootsmeta);
            player.addPotionEffect(new PotionEffect(PotionEffectType.SPEED, 160, 1));
        }
    }

now the code actually does work but it keeps running errors...

Line 84 is

Code:java

 
        if(player.getInventory().getBoots().getType() == Material.CHAINMAIL_BOOTS){

 

CrazyGuy3000
Now what would happen if the player isn't wearing any boots, and you try to check their type? NullPointerException. Before checking the type, make sure they're not null.

 

Assist
Thanks, sorry can't believe I didn't think to check that, will have to remember that in future!