[BUG] Rolling on LootTable which uses nested LootTables intermittently fails with error

[PlasticMohawk]

This is in Foundry v9. I also have LootSheetNpc5E installed despite the compatibility warning. However, the issue seems to exist even with that other module disabled.

I have a Better RollTable set up as a Loot Table. This table uses other, nested Loot Tables.

Intermittently, rolling on this table using the following macro fails, with the error below.

Macro:

const table = game.tables.getName("Treasure Hoard - CR 0-4");
game.betterTables.generateChatLoot(table);

Chrome console error:

loot-creator.js:130 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'data')
[Detected 1 package: better-rolltables]
    at LootCreator.buildItemData (modules/better-rolltables/scripts/loot/loot-creator.js:130)
    at async LootChatCard.findOrCreateItems (modules/better-rolltables/scripts/loot/loot-chat-card.js:39)
    at async LootChatCard.prepareCharCart (modules/better-rolltables/scripts/loot/loot-chat-card.js:111)
    at async LootChatCard.createChatCard (modules/better-rolltables/scripts/loot/loot-chat-card.js:151)
    at async BetterTables.generateChatLoot (modules/better-rolltables/scripts/better-tables.js:94)

When this happens, no ChatMessage containing loot enters chat. (When there is a successful table roll/ChatMessage creation, I'm not able to interact with the items in the ChatMessage. There are no console errors when I, for example, click on one of the items.