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

@@ -110,8 +110,10 @@ public class Fabric extends BasicListener {
         }
 
         if(Utils.handleMods(player,mods)) {
-            checkedPlayers.add(player);
-            if(!checkedPlayers.contains(player)) Message.send("MODIFICATION_CHECK_SUCCESS", player);
+            if(!checkedPlayers.contains(player)) {
+                Message.send("MODIFICATION_CHECK_SUCCESS", player);
+                checkedPlayers.add(player);
+            }
             Storage.fabricPlayers.remove(player);
         }
     }