When trying to remove an item entry from random things from a loot table the following error message occurs: Backing pool cannot be null! Removing the entire pool works (meaning it gives the desired result of the item not generating in chests).

How to replicate
Use the script below together with LootTweaker and Random Things. When loading a save file the Error appears.

Version Info (Exact versions only):
LootTweaker: 1.10.2-0.0.6.5
CraftTweaker: 1.10.2-3.0.26
Forge: 1.10.2 forge-12.18.3.2511
Minecraft: 1.10.2
Random Things: 1.10.2-3.7.7.1

Logs, scripts and other useful information:

import loottweaker.vanilla.loot.LootTables;
import loottweaker.vanilla.loot.LootTable;
import loottweaker.vanilla.loot.LootPool;
import loottweaker.vanilla.loot.Conditions;
import loottweaker.vanilla.loot.Functions;

val simple_dungeon = LootTables.getTable("chests/simple_dungeon");

val lavaCharm = simple_dungeon.getPool("randomthings:lavaCharm");
lavaCharm.removeItemEntry(<randomthings:lavaCharm>);

Note:
The pools from random things all have only one entry each and the name is the same as the item which they generate.

Thanks, I'll take a look.

Welp, I've tracked down the issue and fixed it. Oddly enough I appear to have fixed it for 1.11 and 1.12 awhile ago, but I seem to have missed 1.10.2.

I'll be making a bugfix release for this bug shortly, as it has a large impact.