Java Edition 1.15.1/Development versions

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This is a list of Java Edition 1.15.1 development versions.

1.15.1 Pre-release 1

1.15.1 Pre-release 1 (known as 1.15.1-pre1 in the launcher) is the first and only pre-release for Java Edition 1.15.1, released on December 12, 2019, the last of the year.[1]



Network handling
  • Improved network handling of invalid biome IDs.
  • Optimized chunk rendering performance, especially for chunks with many different block states.


5 issues fixed
From released versions before 1.15
  • MC-135050NullPointerException while tesselating block model.
From 1.15
  • MC-167482 – Corrupt chunk causes force upgrading a world to fail.
  • MC-167530 – Anvils causing java.lang.StackOverflowError.
  • Fixed an error that was spammed to the game's log files caused by custom spawner blocks spawning villagers.
  • Fixed a crash that occurred in the Realms screen.

Notes and references

  1. "Minecraft 1.15.1 Pre-Release 1" –, December 12, 2019