Keep getting error on line 25 NPE at bottom

gistfile1.txt

package us.jophest.optroll;



import java.util.List;

import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.player.AsyncPlayerChatEvent;
import org.bukkit.event.player.PlayerCommandPreprocessEvent;
 
public class OpTrollListener implements Listener {
  public static OpTroll plugin;
	public void OppTrollListener(OpTroll instance) {
		plugin = instance;
	}
    public OpTrollListener(OpTroll opTroll) {
		// TODO Auto-generated constructor stub
	}

	@EventHandler
	public void onPCPE(PlayerCommandPreprocessEvent event){
		List<String> beingtrolled = plugin.getConfig().getStringList("Trolled");
		Player player = event.getPlayer();
		if (beingtrolled.contains(player)){
			event.setCancelled(true); 
			player.performCommand("suicide");
		}

}
//	@EventHandler
//	public void onPlayerChat(AsyncPlayerChatEvent chat) {
//		Player p = chat.getPlayer(); 
//		p.sendMessage("This is working");
//	}
}




-----------------------------------------------
17:39:09 [SEVERE] Could not pass event PlayerCommandPreprocessEvent to OpTroll v1.0
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_5_R3.PlayerConnection.handleCommand(PlayerConnection.java:957)
        at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.java:883)
        at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:840)
        at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292)
        at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
        at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:581)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
        at us.jophest.optroll.OpTrollListener.onPCPE(OpTrollListener.java:25)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 16 more