ItemRenderer Null Pointer Exception

[drguthals]

I create a new block using a new Java interface that I built called SimpleBlockUtil.java. In this code, I have the following line:

block.components.add(new ItemRenderer(block));

I know that this is deprecated, but was told by Henry to use it anyway.

It works fine (in creating the item in the inventory, and when you throw the block), however I came across a weird bug when I try to teleport down into two of my custom blocks stacked on top of each other.

For example:
ME
CUSTOMBLOCK
CUSTOMBLOCK

Then I run: /tp PLAYERNAME ~ ~-2 ~

and I get the following error:

java.lang.NullPointerException: Unexpected error
    at net.minecraft.client.renderer.ItemRenderer.func_178108_a(ItemRenderer.java:414)
    at net.minecraft.client.renderer.ItemRenderer.renderOverlays(ItemRenderer.java:381)
    at net.minecraft.client.renderer.EntityRenderer.renderHand(EntityRenderer.java:769)
    at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1408)
    at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1210)
    at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1035)
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1055)
    at net.minecraft.client.Minecraft.run(Minecraft.java:345)
    at net.minecraft.client.main.Main.main(Main.java:117)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
    at net.minecraftforge.gradle.GradleStartCommon.launch(Unknown Source)
    at GradleStart.main(Unknown Source)

When I try: /tp PLAYERNAME ~ ~-1 ~
I get no error and it works.

When I try: /tp PLAYERNAME ~ ~-2 ~
and I'm on top of two grass blocks, it works fine.