Problem/Bug Player Hider

Im making a Player Hider for my LobbySystem, normally i always could Switch from (Player: true) to (Player: off) but i cant...

Code:

package me.Blue.lobbysystem.listener;



import org.bukkit.Bukkit;

import org.bukkit.Material;

import org.bukkit.entity.Player;

import org.bukkit.event.EventHandler;

import org.bukkit.event.Listener;

import org.bukkit.event.block.Action;

import org.bukkit.event.player.PlayerInteractEvent;

import org.bukkit.inventory.meta.ItemMeta;



import me.Blue.lobbysystem.Main;

public class InteractEvent implements Listener{

@EventHandler
publicvoidonInteract(PlayerInteractEvente){
Player p =e.getPlayer();

if(e.getAction()== Action.RIGHT_CLICK_AIR||e.getAction()== Action.RIGHT_CLICK_BLOCK){
if(e.getMaterial()== Material.BLAZE_ROD){
if(e.getItem().getItemMeta().getDisplayName().equalsIgnoreCase("§7> §dSpieler: §asichtbar §7<"))
e.getItem().setType(Material.STICK);
ItemMeta m1 =e.getItem().getItemMeta();
m1.setDisplayName("§7> §dSpieler: §cunsichtbar §7<");
e.getItem().setItemMeta(m1);
for(Player all :Bukkit.getOnlinePlayers()){
p.hidePlayer(all);
}
Main.hidden.add(p);
}else if(e.getMaterial()== Material.STICK){
if(e.getItem().getItemMeta().getDisplayName().equalsIgnoreCase("§7> §dSpieler: §cunsichtbar §7<")){
ItemMeta m1 =e.getItem().getItemMeta();
m1.setDisplayName("§7> Spieler §asichtbar §7<");
e.getItem().setType(Material.BLAZE_ROD);
e.getItem().setItemMeta(m1);
for(Player all :Bukkit.getOnlinePlayers()){
p.showPlayer(all);
}
Main.hidden.remove(p);
}

}
}
}
}