java.lang.NullPointerException: Tesselating block model

What it looks like in the log

java.lang.NullPointerException: Tesselating block model

How to fix it

1. Check the `-- Block model being tesselated --` section in your crash report to find the `Block:` name (showing which mod owns the block) and the `Block location:` coordinates.
2. If you use OptiFine or OptiFabric, remove it or turn off Connected Textures in Options > Video Settings > Quality, as it frequently breaks custom modded models like Botania's floating flowers.
3. If you play on Fabric or Quilt with Sodium, install the Indium mod and update Fabric API to the latest version for your Minecraft release so custom multipart models render properly.
4. Disable all active resource packs in your options (or remove them from the `resourcepacks` folder before launching) to rule out a broken custom block model or blockstate file.
5. Update the mod named in the `Block:` details line, or use a world editor like Amulet to delete the block at the reported `Block location` coordinates if your character crashes immediately on login.

Check your own log