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{{Infobox version<br />
|title=Minecraft 1.15.1 Pre-release 1<br />
|image=1.15.1-pre1.jpg<br />
|image2=Java Edition 1.15.1 Pre-release 1.png<br />
|edition=Java<br />
|type=Pre-release<br />
|date=December 12, 2019<br />
|clienthash=70e27f84a178951b0df7c42c7b9313782cb9925e<br />
|clientmap=cc77cb804c2cc0fa151b0745df4c5de8e64d1bb5<br />
|jsonfile=1.15.1-pre1<br />
|jsonhash=f5db8e3035a5fa26199718f325e79c762104e768<br />
|serverhash=289a247dd42928880769398b049d3890513f2917<br />
|servermap=47f8a03f5492223753f5f2b531d4938813903684<br />
|parent=1.15.1<br />
|prevparent=1.15<br />
|next=<br />
|nextparent=1.15.2<br />
}}<onlyinclude><br />
<br />
'''1.15.1 Pre-release 1''' (known as '''1.15.1-pre1''' in the launcher) is the first and only pre-release for [[Minecraft:Java Edition 1.15.1]], released on December 12, 2019. This is the final pre-release released in 2019, as well as the 2010s decade.<ref>{{Mcnet|minecraft-1-15-1-pre-release-1|Minecraft 1.15.1 Pre-Release 1|December 12, 2019}}</ref><br />
<br />
== Changes ==<br />
=== General ===<br />
'''Network handling'''<br />
* Improved network handling of invalid [[Minecraft:biome]] IDs.<br />
<br />
'''Performance'''<br />
* Optimized [[Minecraft:chunk]] rendering performance, especially for chunks with many different [[Minecraft:block]] states.<br />
<br />
== Fixes ==<br />
{{fixes<br />
|fixedin=1.15.1 Pre-Release 1|prefix=<br />
|;From released versions before 1.15<br />
|135050|{{cd|NullPointerException}} while tesselating block model.<br />
|;From 1.15<br />
|167482|Corrupt chunk causes force upgrading a world to fail.<br />
|167530|Anvils causing {{cd|java.lang.StackOverflowError}}.<br />
|otherissuescount=2<br />
}}<br />
'''Other'''<br />
* Fixed an error that was spammed to the game's log files caused by custom [[Minecraft:monster spawner]]s spawning [[Minecraft:villager]]s.<br />
* Fixed a crash that occurred in the [[Minecraft:Realms]] screen.</onlyinclude><br />
<br />
== Videos ==<br />
{{Slicedlime|dzkee1pIyV4}}<onlyinclude><br />
<br />
== Trivia ==<br />
* 1.15.1-pre1 is the last pre-release to be released in [[Minecraft:Timeline of events|2019]] and the 2010s decade.</onlyinclude><br />
<br />
== References ==<br />
{{reflist}}<br />
<br />
== Navigation ==<br />
{{Navbox Java Edition versions|1.1x}}<br />
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