closeInventory() is so buggy

Help me, I have this code and I want to close player2's inventory when player1 will close it. Yes, in the inventory 2 players at the same time.
playerList is an arraylist with 2 players in it.

Code:java

 @EventHandler
public void onInvClose(InventoryCloseEvent e){
   if(e.getInventory().getName().equals("test")){
      if(e.getPlayer() == playerList.get(0)){
         if(playerList.get(1).getOpenInventory().getTitle().equals("test")){
            playerList.get(1).getOpenInventory().close(); //this summons trillion errors
            playerList.get(0).sendMessage(pluginPrefix + "you closed inv");
            playerList.get(1).sendMessage(pluginPrefix + "inv was closed by " + traders.get(0));
            playerList.remove(0);
            playerList.remove(1);
 
}
}
   if(e.getInventory().getName().equals("test")){ //oops, small mistake, did it twice
      if(e.getPlayer() == playerList.get(1)){
         if(playerList.get(0).getOpenInventory().getTitle().equals("test")){
           playerList.get(1).getOpenInventory().close();
           playerList.get(1).sendMessage(pluginPrefix + "you closed inv");
           playerList.get(0).sendMessage(pluginPrefix + "inv was closed by " + ChatColor.GOLD + traders.get(1).getDisplayName());
           playerList.remove(0);
           playerList.remove(1);
}
}
}
}
}

Also, I'm still learning java, so the code isn't too good

 

Try playerList.get(1).closeInventory()

By the way: Don't save Players in Lists/Sets. Use Strings or UUIDs instead.