Unexpected error when placing custom fluid from custom bucket

I keep getting this error no matter what I do.

My ItemMudBucket.java(my custom bucket, meant to place my custom fluid on right click):

package com.caske2000.carnivores.items;

import java.util.List;

import net.minecraft.block.Block;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Blocks;
import net.minecraft.init.Items;
import net.minecraft.item.ItemBucket;
import net.minecraft.item.ItemStack;
import net.minecraft.world.World;
import net.minecraftforge.fluids.Fluid;
import net.minecraftforge.fluids.FluidContainerRegistry;

import org.apache.commons.lang3.StringUtils;

import com.caske2000.carnivores.handler.BucketHandler;
import com.caske2000.carnivores.reference.Reference;

import cpw.mods.fml.common.registry.GameRegistry;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;


public class ItemMudBucket extends ItemBucket{

  public static ItemMudBucket create(Fluid fluid) {
    ItemMudBucket b = new ItemMudBucket(fluid.getBlock() != null ? fluid.getBlock() : Blocks.air, fluid.getName());
    b.init();

    FluidContainerRegistry.registerFluidContainer(fluid, new ItemStack(b), new ItemStack(Items.bucket));
    BucketHandler.INSTANCE.registerFluid(fluid.getBlock(), b);

    return b;
  }

  private String fluidName = "mud";

  protected ItemMudBucket(Block block, String fluidName) {
    super(block);
    this.fluidName = fluidName;
    setCreativeTab(CreativeTabs.tabMisc);
    setContainerItem(Items.bucket);
    setUnlocalizedName("bucket_mud");
    setTextureName(Reference.MODID + ":" + "bucket_mud");
  }

  protected void init() {
    GameRegistry.registerItem(this, "bucket" + StringUtils.capitalize(fluidName));
  }

  

}

Error report:

java.lang.NullPointerException
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.func_150818_a(ExtendedBlockStorage.java:96) ~[ExtendedBlockStorage.class:?]
at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:667) ~[Chunk.class:?]
at net.minecraft.world.World.setBlock(World.java:515) ~[World.class:?]
at net.minecraft.item.ItemBucket.tryPlaceContainedLiquid(ItemBucket.java:210) ~[itemBucket.class:?]
at net.minecraft.item.ItemBucket.onItemRightClick(ItemBucket.java:142) ~[itemBucket.class:?]
at net.minecraft.item.ItemStack.useItemRightClick(ItemStack.java:167) ~[itemStack.class:?]
at net.minecraft.client.multiplayer.PlayerControllerMP.sendUseItem(PlayerControllerMP.java:434) ~[PlayerControllerMP.class:?]
at net.minecraft.client.Minecraft.func_147121_ag(Minecraft.java:1557) ~[Minecraft.class:?]
at net.minecraft.client.Minecraft.runTick(Minecraft.java:2044) ~[Minecraft.class:?]
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1039) ~[Minecraft.class:?]
at net.minecraft.client.Minecraft.run(Minecraft.java:961) [Minecraft.class:?]
at net.minecraft.client.main.Main.main(Main.java:164) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_67]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.11.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_67]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
at GradleStart.bounce(GradleStart.java:107) [start/:?]
at GradleStart.startClient(GradleStart.java:100) [start/:?]
at GradleStart.main(GradleStart.java:55) [start/:?]