Wrong Minecraft version

Crash Joining World: Cannot read field "field_3911" because "this.field_4015.field_1724" is null

What it looks like in the log

java.lang.NullPointerException: Cannot read field "field_3911" because "this.field_4015.field_1724" is null` when using the "latest" Sodium and Iris f

How to fix it

  1. Open your Minecraft `mods` folder and delete both the `iris` and `sodium` `.jar` files currently installed.
  2. Download the official Iris Installer from the IrisShaders website or GitHub releases and let it automatically fetch a verified, matching pair of Iris and Sodium for your exact Minecraft version.
  3. If you prefer managing mods manually (such as in Prism Launcher, CurseForge, or Modrinth App), check the Dependencies tab on the Iris download page and install the exact Sodium release version listed for your sub-version (do not mix 1.18 and 1.18.1 builds, or alpha/RC builds).
  4. Relaunch Minecraft and load your world to confirm the crash is resolved.
LoadersFabric
SeverityStops the game
CategoryWrong Minecraft version

Check your own log

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