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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-5672] Crash when trying to convert an old world</title>
                <link>https://bugs.mojang.com/browse/MC-5672</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;Minecraft crashes when trying to convert Skylands 1.3.&lt;/p&gt;

&lt;p&gt;The map can be downloaded from here : &lt;a href=&quot;http://www.minecraftforum.net/topic/35387-survskylands-13-custom-world-thats-entirely-abandoned/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.minecraftforum.net/topic/35387-survskylands-13-custom-world-thats-entirely-abandoned/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;A crash report is attached.&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;Description: Reading NBT data
java.lang.ClassCastException: bx cannot be &lt;span class=&quot;code-keyword&quot;&gt;cast&lt;/span&gt; to bz
	at bq.f(SourceFile:134)
	at aah.a(SourceFile:30)
	at ahs.a(SourceFile:210)
	at ahs.a(SourceFile:181)
	at ahs.a(SourceFile:140)
	at net.minecraft.server.MinecraftServer.b(SourceFile:394)
	at bdz.a(SourceFile:54)
	at bdz.c(SourceFile:99)
	at net.minecraft.server.MinecraftServer.run(SourceFile:588)
	at fy.run(SourceFile:849)
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;</description>
                <environment>Ubuntu 12.10 64-bit&lt;br/&gt;
&lt;br/&gt;
java version &amp;quot;1.7.0_09&amp;quot;&lt;br/&gt;
OpenJDK Runtime Environment (IcedTea7 2.3.3) (7u9-2.3.3-0ubuntu1~12.10.1)&lt;br/&gt;
OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode)&lt;br/&gt;
&lt;br/&gt;
LWJGL 2.8.5</environment>
        <key id="18315">MC-5672</key>
            <summary>Crash when trying to convert an old world</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="k-o-x">Nicolas Joyard</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Jan 2013 10:04:11 +0100</created>
                <updated>Sat, 19 Oct 2013 13:12:03 +0200</updated>
                            <resolved>Wed, 13 Feb 2013 22:12:16 +0100</resolved>
                                    <version>Minecraft 1.4.6</version>
                    <version>Minecraft 1.6.4</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                            <comments>
                            <comment id="100807" author="immibis" created="Wed, 4 Sep 2013 06:27:12 +0200"  >&lt;p&gt;&lt;a href=&quot;http://puu.sh/3wRi3.zip&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://puu.sh/3wRi3.zip&lt;/a&gt; is a world which has this problem which has never been used with third-party software.&lt;/p&gt;</comment>
                            <comment id="45580" author="kumasasa" created="Wed, 13 Feb 2013 22:12:16 +0100"  >&lt;p&gt;Invalid due to buggy 3rd party software.&lt;/p&gt;</comment>
                            <comment id="38034" author="kumasasa" created="Fri, 18 Jan 2013 22:20:07 +0100"  >&lt;p&gt;Even if lots of older maps do this, i would say that &lt;b&gt;all&lt;/b&gt; these maps are &lt;b&gt;corrupted&lt;/b&gt;.&lt;/p&gt;

&lt;p&gt;The error&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;-- Corrupt NBT tag --
Details:
	Tag type found: INT
	Tag type expected: LONG
	Tag name: LastUpdate
	Tag parent: Level
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;p&gt;The description of the tag &lt;em&gt;LastUpdate&lt;/em&gt; in &lt;a href=&quot;http://www.minecraftwiki.net/wiki/Chunk_format#NBT_Structure&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wiki:Chunk Format&lt;/a&gt; and &lt;a href=&quot;http://www.minecraftwiki.net/wiki/Alpha_level_format#Chunk_Format&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wiki:Alpha Level Format&lt;/a&gt; shows that this tag is and always was a &lt;em&gt;LONG&lt;/em&gt; and never an &lt;em&gt;INT&lt;/em&gt;.&lt;/p&gt;

&lt;p&gt;So this isn&apos;t a Minecraft issue, it&apos;s an issue of the creators of this worlds.&lt;/p&gt;


</comment>
                            <comment id="32038" author="firehunterx" created="Wed, 2 Jan 2013 13:40:57 +0100"  >&lt;p&gt;Lots of older maps do this.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="20633">MC-7821</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="23042">MC-9437</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="26659">MC-11940</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="31042">MC-15330</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="41550">MC-22449</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="57600">MC-35650</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="57880">MC-35915</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10103">
                    <name>Relates</name>
                                            <outwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="18054">MC-5446</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="16523" name="crash-2013-01-02_09.55.25-server.txt" size="1866" author="k-o-x" created="Wed, 2 Jan 2013 10:04:11 +0100"/>
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