diff --git a/src/de/steamwar/bungeecore/listeners/mods/Fabric.java b/src/de/steamwar/bungeecore/listeners/mods/Fabric.java
index 825d80ed..ea1e2f9b 100644
--- a/src/de/steamwar/bungeecore/listeners/mods/Fabric.java
+++ b/src/de/steamwar/bungeecore/listeners/mods/Fabric.java
@@ -19,7 +19,10 @@
 
 package de.steamwar.bungeecore.listeners.mods;
 
-import com.google.gson.*;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonSyntaxException;
 import de.steamwar.bungeecore.BungeeCore;
 import de.steamwar.bungeecore.Message;
 import de.steamwar.bungeecore.Storage;
@@ -27,8 +30,10 @@ import de.steamwar.bungeecore.listeners.BasicListener;
 import de.steamwar.bungeecore.sql.Mod;
 import de.steamwar.bungeecore.sql.Punishment;
 import de.steamwar.bungeecore.sql.SteamwarUser;
+import net.md_5.bungee.BungeeCord;
 import net.md_5.bungee.api.connection.ProxiedPlayer;
 import net.md_5.bungee.api.event.PluginMessageEvent;
+import net.md_5.bungee.api.event.ServerSwitchEvent;
 import net.md_5.bungee.event.EventHandler;
 
 import java.nio.charset.StandardCharsets;
@@ -36,6 +41,7 @@ import java.nio.charset.UnsupportedCharsetException;
 import java.sql.Timestamp;
 import java.time.Instant;
 import java.util.*;
+import java.util.concurrent.TimeUnit;
 import java.util.logging.Level;
 
 public class Fabric extends BasicListener {
@@ -43,12 +49,27 @@ public class Fabric extends BasicListener {
     private final Set<String> neededMods = new HashSet<>();
 
     public static final Map<ProxiedPlayer, Integer> checkedPlayers = new HashMap<>();
+    private static final Map<ProxiedPlayer, Long> expectPluginMessage = new HashMap<>();
 
     {
         neededMods.add("java");
         neededMods.add("minecraft");
         neededMods.add("fabricloader");
         neededMods.add("steamwarmodsender");
+
+        BungeeCord.getInstance().getScheduler().schedule(BungeeCore.get(), () -> {
+            synchronized (expectPluginMessage) {
+                for (Map.Entry<ProxiedPlayer, Long> entry : expectPluginMessage.entrySet()) {
+                    if (!checkedPlayers.containsKey(entry.getKey())) {
+                        continue;
+                    }
+                    if (System.currentTimeMillis() - entry.getValue() > TimeUnit.SECONDS.toMillis(20)) {
+                        banPlayer(SteamwarUser.get(entry.getKey()), entry.getKey());
+                        return;
+                    }
+                }
+            }
+        }, 0, 1, TimeUnit.SECONDS);
     }
 
     @EventHandler
@@ -63,6 +84,16 @@ public class Fabric extends BasicListener {
         ProxiedPlayer player = (ProxiedPlayer) e.getSender();
         SteamwarUser user = SteamwarUser.get(player.getUniqueId());
 
+        if (!checkedPlayers.containsKey(player)) {
+            synchronized (expectPluginMessage) {
+                if (expectPluginMessage.containsKey(player)) {
+                    banPlayer(user, player);
+                    return;
+                }
+            }
+        }
+        expectPluginMessage.remove(player);
+
         List<Mod> mods = new LinkedList<>();
 
         byte[] data = e.getData();
@@ -124,6 +155,14 @@ public class Fabric extends BasicListener {
         }
     }
 
+    @EventHandler
+    public void onServerSwitchEvent(ServerSwitchEvent e) {
+        if (e.getFrom() == null) return;
+        synchronized (expectPluginMessage) {
+            expectPluginMessage.put(e.getPlayer(), System.currentTimeMillis());
+        }
+    }
+
     private boolean isSortedAlphabetically(List<Mod> mods) {
         boolean isSorted = true;
         for(int i = 0; i < mods.size() - 1; i++) {
@@ -150,4 +189,11 @@ public class Fabric extends BasicListener {
                 true);
         BungeeCore.log(Level.SEVERE,Message.parse("MODIFICATION_BAN_LOG", player, user.getUserName()));
     }
+
+    public static void remove(ProxiedPlayer player) {
+        checkedPlayers.remove(player);
+        synchronized (expectPluginMessage) {
+            expectPluginMessage.remove(player);
+        }
+    }
 }
diff --git a/src/de/steamwar/bungeecore/listeners/mods/ModLoaderBlocker.java b/src/de/steamwar/bungeecore/listeners/mods/ModLoaderBlocker.java
index 134c7f8d..9965c3e6 100644
--- a/src/de/steamwar/bungeecore/listeners/mods/ModLoaderBlocker.java
+++ b/src/de/steamwar/bungeecore/listeners/mods/ModLoaderBlocker.java
@@ -28,7 +28,6 @@ import net.md_5.bungee.api.event.PluginMessageEvent;
 import net.md_5.bungee.api.event.ServerSwitchEvent;
 import net.md_5.bungee.event.EventHandler;
 
-import java.nio.charset.StandardCharsets;
 import java.util.HashSet;
 import java.util.Set;
 
@@ -47,18 +46,22 @@ public class ModLoaderBlocker extends BasicListener {
 
         if(new String(e.getData()).contains("fabric")){
             ProxiedPlayer p = (ProxiedPlayer) sender;
-            Storage.fabricPlayers.add(p);
-            Message.send("MODLOADER_INSTALLED", p, "Fabric");
+            if (!Fabric.checkedPlayers.containsKey(p) && !Storage.fabricPlayers.contains(p)) {
+                Storage.fabricPlayers.add(p);
+                Message.send("MODLOADER_INSTALLED_FABRIC", p, "Fabric");
+            }
         }else if(new String(e.getData()).contains("LiteLoader")) {
             ProxiedPlayer p = (ProxiedPlayer) sender;
-            Storage.fabricPlayers.add(p);
-            Message.send("MODLOADER_INSTALLED", p, "LiteLoader");
+            if (!Storage.fabricPlayers.contains(p)) {
+                Storage.fabricPlayers.add(p);
+                Message.send("MODLOADER_INSTALLED", p, "LiteLoader");
+            }
         }
     }
 
     @EventHandler
     public void onDisconnect(PlayerDisconnectEvent e){
-        Fabric.checkedPlayers.remove(e.getPlayer());
+        Fabric.remove(e.getPlayer());
         Storage.fabricPlayers.remove(e.getPlayer());
     }
 
diff --git a/src/de/steamwar/messages/BungeeCore.properties b/src/de/steamwar/messages/BungeeCore.properties
index 8542153a..e985aaaf 100644
--- a/src/de/steamwar/messages/BungeeCore.properties
+++ b/src/de/steamwar/messages/BungeeCore.properties
@@ -14,6 +14,7 @@ DEV_UNKNOWN_SERVER=§cBitte gib einen DevServer an.
 
 #ModLoader blocker
 MODLOADER_INSTALLED=§7Du hast §e{0} §7installiert. Daher kannst du keinen Arenen beitreten.
+MODLOADER_INSTALLED_FABRIC=§7Du hast §e{0} §7installiert. Mit dem SteamWarModSender kannst du Arenen beitreten.
 MODLOADER_DENIED=§cMit Fabric, Forge und LiteLoader kannst du keinen Arenen beitreten.
 
 #Help command