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[1.12.2] How can I close GUI in Forge?


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I am trying to write an Minecraft Forge (1.12.2) mod. It should work like that:

OnGuiOpen: If GUI title is equals to constant string value then close GUI (like ESC). That must be known by the server exactly like closing a GUI by clicking E/ESC.


My code (doesn't work - I'm seeing 'Turning off' in console but gui is still turned on)

public class ModEventHandler {
	public void onGuiOpen(GuiOpenEvent event)
		if(event.getGui() instanceof GuiContainer) {
			checkGui((GuiContainer) event.getGui());

	private void checkGui(GuiContainer gui) {
		if(gui.inventorySlots instanceof ContainerChest) {
			ContainerChest _gui = (ContainerChest)gui.inventorySlots;
			String text = _gui.getLowerChestInventory().getDisplayName().getUnformattedText().toString();
			if(text.contains(" ")) {
				System.out.println("Turning off");



Thank u in advance for help ;)

Edited by Filip4223
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6 minutes ago, diesieben07 said:

To prevent the GUI from opening in GuiOpenEvent you need to cancel the event.

I did it, but I think it's only clientside prevention. I gotta send real packet "close gui" to trigger serverside InventoryCloseEvent (or something like that).

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11 minutes ago, diesieben07 said:

Then you must first let the GUI open (GuiOpenEvent fires before its open!) and then call:

OK, it works.Tthanks. :) 


I wonder is there better way for doing it instead of creating new thread? 


System.out.println("Turning off");

Thread thread = new Thread(new CloseGui());

//CloseGui class

public void run() {
  try {
  } catch (InterruptedException e) {



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