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After tinkering for a couple days I have everything working with the addSubstitutionAlias method. So I started substituting blocks and ran into the odd limitation of only being able to substitute 19 blocks. I wrote some test/example code to show the problem (below). Sure enough, if I substitute 19 of the blocks it works great. Add a 20th substitution and I get java.lang.NullPointerException: Initializing game (also below). I also tried the code in the latest 1.11.2 build and got the same thing. Any advice? I'm pretty new here, is there somewhere I should report this as an error? Thanks. package com.example.examplemod; import net.minecraft.block.Block; import net.minecraft.block.BlockOre; import net.minecraft.block.material.Material; import net.minecraft.init.Blocks; import net.minecraft.item.Item; import net.minecraft.item.ItemBlock; import net.minecraft.util.ResourceLocation; import net.minecraftforge.fml.common.Mod; import net.minecraftforge.fml.common.Mod.EventHandler; import net.minecraftforge.fml.common.event.FMLPreInitializationEvent; import net.minecraftforge.fml.common.registry.ExistingSubstitutionException; import net.minecraftforge.fml.common.registry.GameRegistry; @Mod(modid = ExampleMod.MODID, version = ExampleMod.VERSION) public class ExampleMod { public static final String MODID = "examplemod"; public static final String VERSION = "1.0"; @EventHandler public void preInit(FMLPreInitializationEvent event) { substitute(Blocks.COBBLESTONE, new ModBlock("stonebrick")); substitute(Blocks.LAPIS_BLOCK, new ModBlock("blockLapis")); substitute(Blocks.GOLD_BLOCK, new ModBlock("blockGold")); substitute(Blocks.IRON_BLOCK, new ModBlock("blockIron")); substitute(Blocks.BRICK_BLOCK, new ModBlock("brick")); substitute(Blocks.MOSSY_COBBLESTONE, new ModBlock("stoneMoss")); substitute(Blocks.DIAMOND_BLOCK, new ModBlock("blockDiamond")); substitute(Blocks.END_STONE, new ModBlock("whiteStone")); substitute(Blocks.EMERALD_BLOCK, new ModBlock("blockEmerald")); substitute(Blocks.COAL_BLOCK, new ModBlock("blockCoal")); substitute(Blocks.PURPUR_BLOCK, new ModBlock("purpurBlock")); substitute(Blocks.END_BRICKS, new ModBlock("endBricks")); substitute(Blocks.NETHER_WART_BLOCK, new ModBlock("netherWartBlock")); substitute(Blocks.GOLD_ORE, new ModBlockOre("oreGold")); substitute(Blocks.IRON_ORE, new ModBlockOre("oreIron")); substitute(Blocks.COAL_ORE, new ModBlockOre("oreCoal")); substitute(Blocks.LAPIS_ORE, new ModBlockOre("oreLapis")); substitute(Blocks.DIAMOND_ORE, new ModBlockOre("oreDiamond")); substitute(Blocks.EMERALD_ORE, new ModBlockOre("oreEmerald")); substitute(Blocks.QUARTZ_ORE, new ModBlockOre("netherquartz")); } public static void substitute(Block toReplace, Block newBlock) { substitute(toReplace, newBlock, new ItemBlock(newBlock)); } public static void substitute(Block toReplace, Block newBlock, Item newItem) { try { ResourceLocation oldName = Block.REGISTRY.getNameForObject(toReplace); String nameToSubstitute = oldName.toString(); String nameToRegister = ExampleMod.MODID + ":" + oldName.getResourcePath(); newBlock.setRegistryName(nameToRegister); GameRegistry.addSubstitutionAlias(nameToSubstitute.toString(), GameRegistry.Type.BLOCK, newBlock); newItem.setRegistryName(nameToRegister); GameRegistry.addSubstitutionAlias(nameToSubstitute.toString(), GameRegistry.Type.ITEM, newItem); } catch (ExistingSubstitutionException e) { e.printStackTrace(); throw new RuntimeException(e); } } public static class ModBlock extends Block { public ModBlock(String name) { super(Material.ROCK); this.setUnlocalizedName(name); } } public static class ModBlockOre extends BlockOre { public ModBlockOre(String name) { this.setUnlocalizedName(name); } } } The error