Mod conflicts

JEI / REI Crash or Error on Empty Recipe Slot (IndexOutOfBoundsException: Index: 0)

What the log looks like

java\.lang\.IndexOutOfBoundsException: Index: 0[\r\n\s]+at (?:java\.base/)?java\.util\.Collections\$EmptyList\.get.*[\r\n\s]+at me\.shedaniel\.rei\..*setupDisplay
java\.lang\.IndexOutOfBoundsException: Index: 0[\r\n\s]+at (?:java\.base/)?java\.util\.Collections\$EmptyList\.get.*[\r\n\s]+at mezz\.jei\..*(?:legacy)?SetRecipe

How to fix it

  1. If you use Roughly Enough Items (REI) and crash when opening your inventory, close the game and delete the config/roughlyenoughitems folder in your Minecraft directory to clear broken pinned or favorited recipes.
  2. Update Roughly Enough Items (REI) or Just Enough Items (JEI) to the latest release for your Minecraft version, as newer versions include safeguards for empty recipe lists.
  3. Search your latest.log just above the IndexOutOfBoundsException for 'Found a broken recipe' to see which mod owns the faulty recipe, then update that mod to a compatible version.
  4. If you use KubeJS, CraftTweaker, or custom datapacks to edit crafting or stonecutting recipes, check your recent changes for recipes that have an empty ingredient tag or missing result item.
LoadersForge, Neoforge, Fabric, Quilt
SeverityBreaks something
CategoryMod conflicts

Check your own log

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