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  1. Minecraft: Java Edition
  2. MC-192889

When placing certain heads or putting them in entities' head slot the game stutters

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    Details

    • Type: Bug
    • Status: Reopened
    • Resolution: Unresolved
    • Affects Version/s: 1.16.1, 20w27a, 20w28a, 20w30a, 1.16.2 Pre-release 1, 1.16.2 Pre-release 2, 1.16.2 Release Candidate 1, 1.16.2 Release Candidate 2, 1.16.2, 1.16.3 Release Candidate 1, 1.16.3, 20w46a, 20w49a
    • Fix Version/s: None
    • Labels:
      None
    • Confirmation Status:
      Confirmed
    • Category:
      Networking, Performance, Textures and models
    • Mojang Priority:
      Important

      Description

      Give yourself a head with SkullOwner being the f word (Or any invalid name it seems) then place it on the ground this will make the game stutter this also will happen when putting this head and others on entities.
      This may relate to MC-159202

      Error executing task on Server

      java.util.ConcurrentModificationException
      	at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966)
      	at java.util.LinkedList$ListItr.next(LinkedList.java:888)
      	at com.google.common.collect.Iterators$8.next(Iterators.java:896)
      	at com.google.common.collect.Iterators.addAll(Iterators.java:367)
      	at com.google.common.collect.Lists.newArrayList(Lists.java:165)
      	at abl.a(SourceFile:214)
      	at abl.c(SourceFile:198)
      	at abl.a(SourceFile:146)
      	at cei.b(SourceFile:130)
      	at cei.f(SourceFile:113)
      	at cei.a(SourceFile:109)
      	at bzw.a(SourceFile:43)
      	at bim.a(SourceFile:81)
      	at bim.a(SourceFile:41)
      	at bki.a(SourceFile:213)
      	at zf.a(SourceFile:345)
      	at zv.a(SourceFile:976)
      	at sq.a(SourceFile:36)
      	at sq.a(SourceFile:10)
      	at nk.a(SourceFile:21)
      	at uy.run(SourceFile:18)
      	at amn.c(SourceFile:144)
      	at amr.c(SourceFile:23)
      	at net.minecraft.server.MinecraftServer.b(SourceFile:763)
      	at net.minecraft.server.MinecraftServer.c(SourceFile:154)
      	at amn.x(SourceFile:118)
      	at net.minecraft.server.MinecraftServer.aZ(SourceFile:745)
      	at net.minecraft.server.MinecraftServer.x(SourceFile:739)
      	at amn.c(SourceFile:127)
      	at net.minecraft.server.MinecraftServer.w(SourceFile:724)
      	at net.minecraft.server.MinecraftServer.v(SourceFile:676)
      	at net.minecraft.server.MinecraftServer.a(SourceFile:256)
      	at java.lang.Thread.run(Thread.java:745)
      

      Error executing task on Client

      java.lang.NullPointerException
      	at java.util.LinkedList$ListItr.next(LinkedList.java:893)
      	at com.google.common.collect.Iterators$8.next(Iterators.java:896)
      	at com.google.common.collect.Iterators.addAll(Iterators.java:367)
      	at com.google.common.collect.Lists.newArrayList(Lists.java:165)
      	at abl.a(SourceFile:214)
      	at abl.c(SourceFile:198)
      	at abl.a(SourceFile:146)
      	at cei.b(SourceFile:130)
      	at cei.f(SourceFile:113)
      	at cei.a(SourceFile:109)
      	at cei.a(SourceFile:62)
      	at dyn.a(SourceFile:1248)
      	at nv.a(SourceFile:55)
      	at nv.a(SourceFile:11)
      	at nk.a(SourceFile:21)
      	at amn.c(SourceFile:144)
      	at amr.c(SourceFile:23)
      	at amn.x(SourceFile:118)
      	at amn.bj(SourceFile:103)
      	at dlx.e(SourceFile:988)
      	at dlx.e(SourceFile:654)
      	at net.minecraft.client.main.Main.main(SourceFile:215)
      

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              Assignee:
              boq [Mojang] Bartosz Bok
              Reporter:
              O_and_W_W Emmett Quinn
              Votes:
              7 Vote for this issue
              Watchers:
              6 Start watching this issue

                Dates

                Created:
                Updated:
                CHK: