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Description:
When i edit the loottables of some entities the game freezes at "World loading" screen.
The script itself seems to work as it's working for a lot mobs and only some don't work.

Steps to reproduce:

• From the string array remove husk, magma_cube, stray, vex, ender_dragon and it works. I didn't test all of these 5 mobs one by one so i can't say for sure if it's all 5 causing the problem or only like 3-4 or them. (Ender dragon and at least 1 of the other 4 is causing the problem).
• The loot added is from Better questing mod + Standard expansion.
• Same freeze happens with every entity from mods (e.g. Twilight Forest bosses)

Script Used
https://pastebin.com/BxAJRxqP

Version Info(Exact versions only):
LootTweaker-1.12-0.0.6.4

CraftTweaker2-1.12-4.0.8

Forge:14.23.0.2512

Minecraft: 1.12.2

Logs and other useful information:
nothing unusual in minecraft log / crafttweaker log (tables get added for the entities causing the freeze, no error)

Post both logs anyway please. I need as much data as I can get about what's happened in a case like this.

CT log: https://pastebin.com/72ZbvsBa
fml-client-latest (while game is in freezing state): https://pastebin.com/huapNMni
latest.log: https://pastebin.com/0x0MZGTb
crash-server.log: https://pastebin.com/SmKJa8yh (sorry hadn't thought that there can be a crashlog when no crash happens)

You where right, there is a java exception in latest.log caused by LootTweaker (strange that the game doesn't crash from this ?) that isn't there when i remove the 5 mobs from the script.

I think I know what's wrong here. It should be a simple fix.

This may be more difficult than I thought

The tables that cause the issue are tables with no pools. I forgot to check if that pool exists when getting an existing pool.