fix concurrent fard exception i guess

finally !!!!

src/main/java/land/chipmunk/chipmunkmod/modules/Players.java

@@ -6,27 +6,61 @@ import com.mojang.brigadier.suggestion.Suggestions;
 import land.chipmunk.chipmunkmod.data.MutablePlayerListEntry;
 import land.chipmunk.chipmunkmod.listeners.Listener;
 import land.chipmunk.chipmunkmod.listeners.ListenerManager;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.network.ClientPlayNetworkHandler;
 import net.minecraft.network.packet.Packet;
 import net.minecraft.network.packet.s2c.play.CommandSuggestionsS2CPacket;
 import net.minecraft.network.packet.s2c.play.PlayerListS2CPacket;
 import net.minecraft.network.packet.s2c.play.PlayerRemoveS2CPacket;
 import net.minecraft.text.Text;
 
-import java.util.ArrayList;
-import java.util.List;
-import java.util.UUID;
+import java.util.*;
 import java.util.concurrent.CompletableFuture;
 
 public class Players extends Listener {
     public List<MutablePlayerListEntry> list = new ArrayList<>();
 
-    public static Players INSTANCE = new Players();
+    public static Players INSTANCE = new Players(MinecraftClient.getInstance());
 
-    public Players () {
+    private Timer timer;
+
+    private final MinecraftClient client;
+
+    public Players (MinecraftClient client) {
+        this.client = client;
         ListenerManager.addListener(this);
+
+        TabComplete.INSTANCE.init();
     }
 
-    public void init () {}
+    public void init () {
+        final TimerTask task = new TimerTask() {
+            public void run () {
+                tick();
+            }
+        };
+
+        if (timer != null) cleanup();
+
+        timer = new Timer();
+        timer.schedule(task, 0, 50);
+    }
+
+    public void cleanup () {
+        list.clear();
+
+        if (timer == null) return;
+
+        timer.cancel();
+        timer.purge();
+        timer = null;
+    }
+
+    private void tick () {
+        final ClientPlayNetworkHandler networkHandler = client.getNetworkHandler();
+
+        if (networkHandler == null) cleanup();
+    }
 
     @Override
     public void packetReceived (Packet packet) {

src/main/java/land/chipmunk/chipmunkmod/modules/TabComplete.java

@@ -29,6 +29,8 @@ public class TabComplete extends Listener {
         ListenerManager.addListener(this);
     }
 
+    public void init () {}
+
     public CompletableFuture<CommandSuggestionsS2CPacket> complete (String command) {
         final ClientPlayNetworkHandler networkHandler = client.getNetworkHandler();