AchieveHunter crashes on worlds with too many advancements

[rojorum24]

When opening and clicking on an advancement on a world with a large number of completed advancements the game crashes with IllegalArgumentException: Comparison method violates its general contract!

When playing the game on a fresh test world with a small number of advancements there are no crashes suggesting that the crash might be caused by a list size or complexity. When AchieveHunter is disabled there are no crashes.

From what I can tell the crash comes from the getAdvancementsWithProgress method although admittedly I don't know Java just what I got from looking at the crash report.

---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 2026-04-16 12:51:03
Description: mouseReleased event handler

java.lang.IllegalArgumentException: Comparison method violates its general contract!
at java.base/java.util.TimSort.mergeHi(TimSort.java:903)
at java.base/java.util.TimSort.mergeAt(TimSort.java:520)
at java.base/java.util.TimSort.mergeForceCollapse(TimSort.java:461)
at java.base/java.util.TimSort.sort(TimSort.java:254)
at java.base/java.util.Arrays.sort(Arrays.java:1308)
at java.base/java.util.ArrayList.sort(ArrayList.java:1804)
at knot//net.minecraft.class_457.getAdvancementsWithProgress(class_457.java:919)
at knot//net.minecraft.class_457.achievehunter$onMouseReleased(class_457.java:1455)
at knot//net.minecraft.class_4069.handler$zzg000$achievehunter$onMouseReleasedInAdvancementsScreen(class_4069.java:524)
at knot//net.minecraft.class_4069.method_25406(class_4069.java)
at knot//net.minecraft.class_312.mixinextras$bridge$method_25406$41(class_312.java)
at knot//net.minecraft.class_312.wrapOperation$bid000$fabric-screen-api-v1$invokeMousePressedEvents(class_312.java:1068)
at knot//net.minecraft.class_312.method_1601(class_312.java:128)
at knot//net.minecraft.class_312.method_22686(class_312.java:215)
at knot//net.minecraft.class_1255.execute(class_1255.java:110)
at knot//net.minecraft.class_312.method_22684(class_312.java:215)
at knot//org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:43)
at knot//org.lwjgl.system.JNI.invokeV(Native Method)
at knot//org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:3438)
at knot//com.mojang.blaze3d.systems.RenderSystem.pollEvents(RenderSystem.java:149)
at knot//com.mojang.blaze3d.systems.RenderSystem.flipFrame(RenderSystem.java:170)
at knot//net.minecraft.class_1041.method_15998(class_1041.java:318)
at knot//net.minecraft.class_310.method_1523(class_310.java:1361)
at knot//net.minecraft.class_310.method_1514(class_310.java:922)
at knot//net.minecraft.client.main.Main.main(Main.java:267)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:514)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:72)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:105)
at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129)