[MC-227537] Crash: java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "$$4" is null

The bug

I received the error java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "$$4" is null in my game's log today. I am unsure of the cause of the issue, because I wasn't monitoring my game's log at the time.

As of 1.18 Pre-release 7, this causes a crash.

Exception in server tick loop
java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "$$4" is null
	at adb.b(SourceFile:230)
	at acv.a(SourceFile:1044)
	at adg.a(SourceFile:457)
	at aea.a(SourceFile:927)
	at vp.a(SourceFile:114)
	at vp$a.a(SourceFile:42)
	at qt.a(SourceFile:21)
	at yx.run(SourceFile:18)
	at auh.c(SourceFile:151)
	at aul.c(SourceFile:23)
	at net.minecraft.server.MinecraftServer.b(SourceFile:780)
	at net.minecraft.server.MinecraftServer.c(SourceFile:162)
	at auh.y(SourceFile:125)
	at net.minecraft.server.MinecraftServer.bf(SourceFile:762)
	at net.minecraft.server.MinecraftServer.y(SourceFile:756)
	at auh.bp(SourceFile:110)
	at net.minecraft.server.MinecraftServer.x(SourceFile:740)
	at net.minecraft.server.MinecraftServer.w(SourceFile:688)
	at net.minecraft.server.MinecraftServer.a(SourceFile:270)
	at java.base/java.lang.Thread.run(Thread.java:833)

Linked issues

is duplicated by

MC-228279 Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "â˜ƒ" is null

MC-229771 Respawn connection loss in LAN world.

MC-231132 Server NullPointer on Superflat world based on Dragon Eggs

MC-242676 Crash on death

relates to

MC-230525 Dedicated server failing to bind to port causes NullPointerException

Attachments

crash-2021-11-24_00.08.32-server.txt

crash-2021-11-24_02.18.57-server.txt

deobf_crash-2021-11-24_00.08.32-server.txt

deobf_crash-2021-11-24_02.18.57-server.txt

Comments

[Mod] markderickson 2021-06-09T02:47:24Z

I was able to reproduce this issue by flying into a single exit end portal block while using an elytra. I'm unsure if this is the specific cause of this issue.

migrated 2021-07-04T17:08:09Z

Reproduction steps in MC-231132

ampolive 2021-07-14T17:31:56Z

I experienced this in my creative test world, but it was Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "☃" is null, with a snowman icon instead of "â˜ƒ".

migrated 2021-07-29T13:56:49Z

Can confirm for 1.17, server hosted on CubedHost. Seems that it was triggered right after a player fell out of the world in The End dimension.

[29-Jul-2021 15:24:32] [INFO] <redacted_username> fell out of the world
[29-Jul-2021 15:24:33] [FATAL] Error executing task on Server
[29-Jul-2021 15:24:33] java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "â˜ƒ" is null
[29-Jul-2021 15:24:33] at abk.b(SourceFile:202) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at abe.a(SourceFile:906) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at abp.a(SourceFile:449) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at acj.a(SourceFile:944) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at uf.a(SourceFile:114) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at uf$a.a(SourceFile:42) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at pm.a(SourceFile:21) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at xm.run(SourceFile:18) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at aqu.c(SourceFile:151) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at aqy.c(SourceFile:23) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at net.minecraft.server.MinecraftServer.b(SourceFile:783) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at net.minecraft.server.MinecraftServer.c(SourceFile:167) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at aqu.z(SourceFile:125) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at net.minecraft.server.MinecraftServer.bg(SourceFile:765) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at net.minecraft.server.MinecraftServer.z(SourceFile:759) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at aqu.bq(SourceFile:110) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at net.minecraft.server.MinecraftServer.y(SourceFile:743) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at net.minecraft.server.MinecraftServer.x(SourceFile:696) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at net.minecraft.server.MinecraftServer.a(SourceFile:274) ~[minecraft-release-1.17.jar:?]
[29-Jul-2021 15:24:33] at java.lang.Thread.run(Thread.java:831) [?:?]

migrated 2021-08-23T06:29:49Z

EDIT: A player entered the end and flew straight away

[15:15:50] [Server thread/INFO]: <PlayerName> fell out of the world
 [15:15:51] [Server thread/FATAL]: Error executing task on Server
 java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "â˜ƒ" is null
 at net.minecraft.class_3204.method_14051(class_3204.java:202) ~[intermediary-server.jar:?]
 at net.minecraft.class_3898.method_18713(class_3898.java:2218) ~[intermediary-server.jar:?]
 at net.minecraft.class_3215.method_14096(class_3215.java:450) ~[intermediary-server.jar:?]
 at net.minecraft.class_3244.method_12063(class_3244.java:927) ~[intermediary-server.jar:?]
 at net.minecraft.class_2828.method_12272(class_2828.java:114) ~[intermediary-server.jar:?]
 at net.minecraft.class_2828$class_2829.method_11054(class_2828.java:42) ~[intermediary-server.jar:?]
 at net.minecraft.class_2600.method_11072(class_2600.java:21) ~[intermediary-server.jar:?]
 at net.minecraft.class_3738.run(class_3738.java:18) ~[intermediary-server.jar:?]
 at net.minecraft.class_1255.method_18859(class_1255.java:151) ~[intermediary-server.jar:?]
 at net.minecraft.class_4093.method_18859(class_4093.java:23) ~[intermediary-server.jar:?]
 at net.minecraft.server.MinecraftServer.method_24306(MinecraftServer.java:788) ~[intermediary-server.jar:?]
 at net.minecraft.server.MinecraftServer.method_18859(MinecraftServer.java:164) ~[intermediary-server.jar:?]
 at net.minecraft.class_1255.method_16075(class_1255.java:125) ~[intermediary-server.jar:?]
 at net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:770) ~[intermediary-server.jar:?]
 at net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:764) ~[intermediary-server.jar:?]
 at net.minecraft.class_1255.method_5383(class_1255.java:110) ~[intermediary-server.jar:?]
 at net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:748) ~[intermediary-server.jar:?]
 at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:701) ~[intermediary-server.jar:?]
 at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:270) ~[intermediary-server.jar:?]
 at java.lang.Thread.run(Thread.java:831) [?:?]

migrated 2021-08-26T17:13:54Z

I've experienced something in 1.17.1.
java.lang.NullPointerException: Cannot invoke "abr.o_()" because "Ô??" is null
Is this somehow related?

ampolive 2021-08-26T19:39:52Z

@unknown That is probably MC-230525.

ampolive 2021-09-17T15:10:53Z

There is an error in 21w37a that is probably the same thing as this:

Error executing task on Server
java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "$$3" is null
	at abp.b(SourceFile:202) ~[21w37a.jar:?]
	at abj.a(SourceFile:982) ~[21w37a.jar:?]
	at abu.a(SourceFile:444) ~[21w37a.jar:?]
	at aco.a(SourceFile:927) ~[21w37a.jar:?]
	at ui.a(SourceFile:114) ~[21w37a.jar:?]
	at ui$a.a(SourceFile:42) ~[21w37a.jar:?]
	at pn.a(SourceFile:21) ~[21w37a.jar:?]
	at xp.run(SourceFile:18) ~[21w37a.jar:?]
	at ash.c(SourceFile:151) ~[21w37a.jar:?]
	at asl.c(SourceFile:23) ~[21w37a.jar:?]
	at net.minecraft.server.MinecraftServer.b(SourceFile:790) ~[21w37a.jar:?]
	at net.minecraft.server.MinecraftServer.c(SourceFile:168) ~[21w37a.jar:?]
	at ash.z(SourceFile:125) ~[21w37a.jar:?]
	at net.minecraft.server.MinecraftServer.bg(SourceFile:772) ~[21w37a.jar:?]
	at net.minecraft.server.MinecraftServer.z(SourceFile:766) ~[21w37a.jar:?]
	at ash.c(SourceFile:134) ~[21w37a.jar:?]
	at net.minecraft.server.MinecraftServer.y(SourceFile:751) ~[21w37a.jar:?]
	at net.minecraft.server.MinecraftServer.x(SourceFile:694) ~[21w37a.jar:?]
	at net.minecraft.server.MinecraftServer.a(SourceFile:274) ~[21w37a.jar:?]
	at java.lang.Thread.run(Thread.java:831) [?:?]

ampolive 2021-10-06T20:15:16Z

Can confirm in 21w39a.

migrated 2021-10-12T18:04:01Z

Also in 21w40a.

wobst.michael 2021-11-17T18:12:30Z

Can this still be reproduced in 1.18-pre3?

[Mod] markderickson 2021-11-18T02:59:53Z

I'm not sure about pre3, but it is still an issue in pre4.

java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "$$4" is null
	at adb.b(SourceFile:230)
	at acv.a(SourceFile:1023)
	at adg.a(SourceFile:457)
	at aea.a(SourceFile:927)
	at vp.a(SourceFile:114)
	at vp$b.a(SourceFile:16)
	at qt.a(SourceFile:21)
	at yx.run(SourceFile:18)
	at auh.c(SourceFile:151)
	at aul.c(SourceFile:23)
	at net.minecraft.server.MinecraftServer.b(SourceFile:780)
	at net.minecraft.server.MinecraftServer.c(SourceFile:162)
	at auh.y(SourceFile:125)
	at net.minecraft.server.MinecraftServer.bf(SourceFile:762)
	at net.minecraft.server.MinecraftServer.y(SourceFile:756)
	at auh.bp(SourceFile:110)
	at net.minecraft.server.MinecraftServer.x(SourceFile:740)
	at net.minecraft.server.MinecraftServer.w(SourceFile:688)
	at net.minecraft.server.MinecraftServer.a(SourceFile:270)
	at java.base/java.lang.Thread.run(Thread.java:833)

migrated 2021-11-24T08:25:08Z

I just had this crash on my server as well, the stack trace matches exactly. One of the players that was online right before the crash claims they died and then the server crashed; the other player was doing inventory management with a chest. I've attached a log for this report. Server is on 1.18-pre7.