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    <title>Mojang Studios Jira</title>
    <link>https://bugs.mojang.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en</language>    <build-info>
        <version>9.12.2</version>
        <build-number>9120002</build-number>
        <build-date>10-01-2024</build-date>
    </build-info>


<item>
            <title>[MC-12341] Crash when a certain player joins / Exception ticking world: ConcurrentModificationException</title>
                <link>https://bugs.mojang.com/browse/MC-12341</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;(Made sure the server was pure vanilla this time. Reproduced crash.)&lt;/p&gt;

&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;---- Minecraft Crash Report ----
&lt;span class=&quot;code-comment&quot;&gt;// I feel sad now :(
&lt;/span&gt;
Time: 3/18/13 9:26 PM
Description: Exception ticking world

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at iy.b(SourceFile:196)
	at iz.b(SourceFile:122)
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at hz.r(SourceFile:255)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at iy.b(SourceFile:196)
	at iz.b(SourceFile:122)

-- Affected level --
Details:
	Level name: world
	All players: 6 total
	Chunk stats: ServerChunkCache: 6138 Drop: 146
	Level seed: 4709343022063829704
	Level generator: ID 00 - &lt;span class=&quot;code-keyword&quot;&gt;default&lt;/span&gt;, ver 1. Features enabled: &lt;span class=&quot;code-keyword&quot;&gt;true&lt;/span&gt;
	Level generator options: 
	Level spawn location: World: (108,64,252), Chunk: (at 12,4,12 in 6,15; contains blocks 96,0,240 to 111,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 204182393 game time, 195675149 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 30350 (now: &lt;span class=&quot;code-keyword&quot;&gt;false&lt;/span&gt;), thunder time: 87283 (now: &lt;span class=&quot;code-keyword&quot;&gt;false&lt;/span&gt;)
	Level game mode: Game mode: survival (ID 0). Hardcore: &lt;span class=&quot;code-keyword&quot;&gt;false&lt;/span&gt;. Cheats: &lt;span class=&quot;code-keyword&quot;&gt;false&lt;/span&gt;
Stacktrace:
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at hz.r(SourceFile:255)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)

-- &lt;span class=&quot;code-object&quot;&gt;System&lt;/span&gt; Details --
Details:
	Minecraft Version: 1.5
	Operating &lt;span class=&quot;code-object&quot;&gt;System&lt;/span&gt;: Linux (amd64) version 3.4.24-nfo
	Java Version: 1.7.0_11, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 62746016 bytes (59 MB) / 550895616 bytes (525 MB) up to 1908932608 bytes (1820 MB)
	JVM Flags: 1 total; -Xmx2048M
	AABB Pool Size: 16910 (946960 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 20344 (1139264 bytes; 1 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 6 / 50
	Is Modded: Unknown (can&apos;t tell)
	Type: Dedicated Server (map_server.txt)&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;</description>
                <environment>See below for full error log</environment>
        <key id="27176">MC-12341</key>
            <summary>Crash when a certain player joins / Exception ticking world: ConcurrentModificationException</summary>
                <type id="1" iconUrl="https://bugs.mojang.com/secure/viewavatar?size=xsmall&amp;avatarId=18903&amp;avatarType=issuetype">Bug</type>
                                    <status id="5" iconUrl="https://bugs.mojang.com/images/icons/statuses/resolved.png" description="A resolution has been taken, and it is awaiting verification by reporter. From here issues are either reopened, or are closed.">Resolved</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="7">Invalid</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="wellfedhobo">Bradley Rhea</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Mar 2013 03:33:20 +0100</created>
                <updated>Fri, 1 Nov 2013 08:34:31 +0100</updated>
                            <resolved>Fri, 1 Nov 2013 08:34:23 +0100</resolved>
                                    <version>Minecraft 1.5</version>
                    <version>Minecraft 1.5.1</version>
                    <version>Minecraft 1.5.2</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                            <comments>
                            <comment id="94616" author="bljat" created="Fri, 26 Jul 2013 23:47:57 +0200"  >&lt;p&gt;No answer, assuming no longer an issue.&lt;/p&gt;</comment>
                            <comment id="78503" author="kumasasa" created="Sat, 29 Jun 2013 10:59:15 +0200"  >&lt;p&gt;Is this still an issue with version 1.6.1 ?&lt;/p&gt;</comment>
                            <comment id="56864" author="simp42" created="Sun, 24 Mar 2013 14:22:25 +0100"  >&lt;p&gt;Commenting on this issue, because &lt;a href=&quot;https://bugs.mojang.com/browse/MC-12485&quot; title=&quot;Exception on SMP server execution&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-12485&quot;&gt;&lt;del&gt;MC-12485&lt;/del&gt;&lt;/a&gt; was marked as a duplicate.&lt;br/&gt;
Bug still exists with 1.5.1 - it now occurs almost every other time somebody uses a nether portal, i.e. when somebody uses a nether portal there seems to be about a 50% chance that the server will crash!&lt;br/&gt;
It might be that it occurs whenever the nether is left using a portal.&lt;/p&gt;</comment>
                            <comment id="55977" author="bljat" created="Thu, 21 Mar 2013 00:34:57 +0100"  >&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeHeader panelHeader&quot; style=&quot;border-bottom-width: 1px;&quot;&gt;&lt;b&gt;&lt;a href=&quot;https://bugs.mojang.com/browse/MC-509&quot; title=&quot;Exception in server tick loop :: ConcurrentModificationException&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-509&quot;&gt;&lt;del&gt;MC-509&lt;/del&gt;&lt;/a&gt;&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt; Description: Exception in server tick loop
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
        at java.util.HashMap$KeyIterator.next(HashMap.java:928)
        at hz.a(SourceFile:90)
        at net.minecraft.server.MinecraftServer.r(SourceFile:721)
        at hg.r(SourceFile:233)
        at net.minecraft.server.MinecraftServer.q(SourceFile:661)
        at net.minecraft.server.MinecraftServer.run(SourceFile:595)
        at fp.run(SourceFile:818)&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeHeader panelHeader&quot; style=&quot;border-bottom-width: 1px;&quot;&gt;&lt;b&gt;&lt;a href=&quot;https://bugs.mojang.com/browse/MC-12341&quot; title=&quot;Crash when a certain player joins / Exception ticking world: ConcurrentModificationException&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-12341&quot;&gt;&lt;del&gt;MC-12341&lt;/del&gt;&lt;/a&gt;&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;Description: Exception ticking world
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at iy.b(SourceFile:196)
	at iz.b(SourceFile:122)
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at hz.r(SourceFile:255)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeHeader panelHeader&quot; style=&quot;border-bottom-width: 1px;&quot;&gt;&lt;b&gt;&lt;a href=&quot;https://bugs.mojang.com/browse/MC-12485&quot; title=&quot;Exception on SMP server execution&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-12485&quot;&gt;&lt;del&gt;MC-12485&lt;/del&gt;&lt;/a&gt;&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;Description: Exception ticking world
java.lang.NullPointerException
	at iy.b(SourceFile:199)
	at iz.b(SourceFile:122)
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at hz.r(SourceFile:255)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;Conclusion: Not dupe of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-509&quot; title=&quot;Exception in server tick loop :: ConcurrentModificationException&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-509&quot;&gt;&lt;del&gt;MC-509&lt;/del&gt;&lt;/a&gt;, but &lt;a href=&quot;https://bugs.mojang.com/browse/MC-12485&quot; title=&quot;Exception on SMP server execution&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-12485&quot;&gt;&lt;del&gt;MC-12485&lt;/del&gt;&lt;/a&gt; dupe of this one.&lt;/p&gt;</comment>
                            <comment id="55383" author="kumasasa" created="Tue, 19 Mar 2013 07:41:23 +0100"  >&lt;p&gt;Duplicate of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-509&quot; title=&quot;Exception in server tick loop :: ConcurrentModificationException&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-509&quot;&gt;&lt;del&gt;MC-509&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="55367" author="cubethethird" created="Tue, 19 Mar 2013 03:39:49 +0100"  >&lt;p&gt;No worries. Now you know for next time.&lt;/p&gt;</comment>
                            <comment id="55366" author="wellfedhobo" created="Tue, 19 Mar 2013 03:38:22 +0100"  >&lt;p&gt;Sorry, I&apos;m a noob to this ticket system. Meant for it to be private until I fixed where I pasted the full log in the wrong place.&lt;/p&gt;</comment>
                            <comment id="55364" author="cubethethird" created="Tue, 19 Mar 2013 03:36:04 +0100"  >&lt;p&gt;Please do not mark issues as private unless they contain sensitive/compromising information.&lt;/p&gt;</comment>
                    </comments>
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