I'm trying to make an item that affects entities within a radius around the player using World#getEntitiesWithinAABB and AxisAlignedBB#expand, but the game crashes whenever I try to create the List<EntityLiving> of entities to affect.

 

Here's the crash log:

[16:18:18] [Client thread/FATAL]: Reported exception thrown!
[16:32:44] [Client thread/FATAL]: Reported exception thrown!
net.minecraft.util.ReportedException: Ticking entity
at net.minecraft.world.World.updateEntities(World.java:1837) ~[World.class:?]
at net.minecraft.client.Minecraft.runTick(Minecraft.java:2176) ~[Minecraft.class:?]
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1080) ~[Minecraft.class:?]
at net.minecraft.client.Minecraft.run(Minecraft.java:376) [Minecraft.class:?]
at net.minecraft.client.main.Main.main(Main.java:117) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_45]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_45]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_45]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_45]
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 net.minecraftforge.gradle.GradleStartCommon.launch(Unknown Source) [start/:?]
at GradleStart.main(Unknown Source) [start/:?]
Caused by: java.lang.NullPointerException
at com.ferret.myfirstmod.items.ItemIceMask.onArmorTick(ItemIceMask.java:85) ~[itemIceMask.class:?]
at net.minecraft.entity.player.InventoryPlayer.decrementAnimations(InventoryPlayer.java:358) ~[inventoryPlayer.class:?]
at net.minecraft.entity.player.EntityPlayer.onLivingUpdate(EntityPlayer.java:623) ~[EntityPlayer.class:?]
at net.minecraft.client.entity.EntityPlayerSP.onLivingUpdate(EntityPlayerSP.java:913) ~[EntityPlayerSP.class:?]
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:1828) ~[EntityLivingBase.class:?]
at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:334) ~[EntityPlayer.class:?]
at net.minecraft.client.entity.EntityPlayerSP.onUpdate(EntityPlayerSP.java:165) ~[EntityPlayerSP.class:?]
at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2031) ~[World.class:?]
at net.minecraft.world.World.updateEntity(World.java:1997) ~[World.class:?]
at net.minecraft.world.World.updateEntities(World.java:1823) ~[World.class:?]
... 12 more

And the method in question:

public void onArmorTick(World world, EntityPlayer player, ItemStack itemStack)
{
	if(KeyBindings.ability.isPressed())
	{
		if(!world.getEntitiesWithinAABB(EntityLiving.class, player.getBoundingBox().expand(10, 10, 10)).isEmpty()) // the problematic line
		{
			List<EntityLiving> entities = world.getEntitiesWithinAABB(EntityLiving.class, player.getBoundingBox().expand(10, 10, 10));
			for(EntityLiving entity : entities)
			{
				if(!entity.equals(player))
				{
					entity.addPotionEffect(new PotionEffect(2, 2000, 99));
				}
			}
		}
	}
}

You do not handle a case where Minecraft cannot find any entities.

 

What is on this line?

 

at com.ferret.myfirstmod.items.ItemIceMask.onArmorTick(ItemIceMask.java:86)

 

EDIT: Woops, i'm blind. I see it.

I tried that, no luck. I've also updated the crash log and code accordingly. It's crashing whenever I even ask about the bounding box (it crashes on the if statement).

It actually crashes on

expand(10, 10, 10)

It crashes even when I don't expand it.

That's because, contrary to all expectation, Entity#getBoundingBox returns NULL. Don't use it. Instead, use Entity#getEntityBoundingBox, which actually returns the entity's bounding box.