Mojira Archive
MC-131599

Opening player inventory with visible recipe book after using beacon causes crash

The bug

First described in this reddit post

Opening the player inventory showing the recipe book (crafting table and furnace apparently do not cause the bug) after using a beacon crashes the game.

Description: Unexpected error

java.lang.ClassCastException: atk cannot be cast to aue
	at cor.a(SourceFile:39)
	at cop.f(SourceFile:84)
	at cop.a(SourceFile:73)
	at coo.d(SourceFile:190)
	at coo.a(SourceFile:114)
	at coo.a(SourceFile:78)
	at cnw.c(SourceFile:54)
	at cmk.a(SourceFile:311)
	at cit.a(SourceFile:725)
	at cit.au(SourceFile:1334)
	at cit.m(SourceFile:1216)
	at cit.c(SourceFile:787)
	at cit.a(SourceFile:379)
	at net.minecraft.client.main.Main.main(SourceFile:144)

How to reproduce

  1. Build a level 1 beacon
  2. Give yourself for example an iron ingot
  3. Switch to Survival
  4. Open your inventory and open the recipe book
  5. Close your inventory while the recipe book is open
  6. Open the beacon GUI, select an effect and use the iron ingot
  7. Close the beacon GUI
  8. Try to open your inventory
    The game crashes

Partial code analysis

It looks like the last method calls would be roughly (parameters and method bodies have changed slightly) the following in MCP 9.40:

Stacktrace
net.minecraft.client.gui.recipebook.GuiButtonRecipe.init(RecipeList, RecipeBookPage, RecipeBook)
net.minecraft.client.gui.recipebook.RecipeBookPage.updateButtonsForPage()
net.minecraft.client.gui.recipebook.RecipeBookPage.updateLists(List<RecipeList>, boolean)
net.minecraft.client.gui.recipebook.GuiRecipeBook.updateCollections(boolean)
net.minecraft.client.gui.recipebook.GuiRecipeBook.initVisuals(boolean, InventoryCrafting)
net.minecraft.client.gui.recipebook.GuiRecipeBook.func_194303_a(int, int, Minecraft, boolean, InventoryCrafting)
net.minecraft.client.gui.inventory.GuiInventory.initGui()
cor.a (1.13-pre2)
public void a(cos cos2, cop cop2) {
	this.r = cos2;
	this.p = (aue)cop2.d().g.bD;
	this.q = cop2.e();
	List<ayx> list = cos2.a(this.q.a(this.p));
	for (ayx ayx2 : list) {
		if (!this.q.d(ayx2)) continue;
		cop2.a(list);
		this.t = 15.0f;
		break;
	}
}
Obfuscated code (1.13-pre2) Deobfuscated
cop2.d().g.bD net.minecraft.entity.player.EntityPlayer.openContainer
atk ContainerBeacon

This suggests that after closing the beacon GUI the container is not reset.

Fixed

Marcono1234

[Mojang] Cory Scheviak

2018-06-18, 03:54 AM

2018-06-28, 11:51 AM

2018-06-28, 11:51 AM

7

4

Confirmed

beacon, recipe-book

Minecraft 1.13-pre2, Minecraft 1.13-pre3, Minecraft 1.13-pre4

Minecraft 1.13-pre5