src/de/steamwar/bungeecore/listeners/mods/Fabric.java

@@ -60,6 +60,9 @@ public class Fabric extends BasicListener {
         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;
@@ -89,6 +92,7 @@ public class Fabric extends BasicListener {
                 }
             }
         }
+        expectPluginMessage.remove(player);
 
         List<Mod> mods = new LinkedList<>();