PlayerCommandPreprocess error

I'm getting an error caused by this event.

Code:

    @EventHandler
    void onCommand(PlayerCommandPreprocessEvent event){
        if(plugin.PlayersBlocked.containsKey(event.getPlayer().getName()) && !plugin.Commands.contains(event.getMessage().substring(1).split(" ")[0])){
            event.setCancelled(true);
            event.getPlayer().sendMessage(ChatColor.Green + "[FairPvP] " + ChatColor.RED + "Sorry, you can't use that command that quick after pvp!");
            return;
        }
     
    }

Code:

012-06-25 15:44:30 [SEVERE] Could not pass event PlayerCommandPreprocessEvent to FairPvP
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:304)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:460)
at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:814)
at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:781)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:764)
at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:34)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.NullPointerException
at me.javoris767.fairpvp.FairPvPListener.onCommand(FairPvPListener.java:19)
at sun.reflect.GeneratedMethodAccessor170.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)
... 12 more

@javoris767
Where is line 19?

Code:

if(plugin.PlayersBlocked.containsKey(event.getPlayer().getName()) && !plugin.Commands.contains(event.getMessage().substring(1).split(" ")[0])){

I think this

check plugin.PlayersBlocked.

Is it initialized?

Yah
Map<String, Boolean> PlayersBlocked = new HashMap<String, Boolean>();

if so, then plugin.Commands is gonna be null. those are the only two objects that would be null at this point.

public List<String> Commands = new ArrayList<String>();
Here is what commands is set as.

So... Whats the problem?

I believe PlayersBlocked doesnt have any entries in it, returning null when you try to grab the boolean value by the key

I think plugin is null

or that.