Game Crash on Ectoplasm Use

[GradualSyrup]

Hi, I have a run I was playing where in an Arcana Pack opening, I decided to pop an Ectoplasm so I could use a visible Wraith. Using this Ecto causes the game to crash on "card.lua:1718: attempt to index local 'eligible_card' (a nil value)".

Shop instance looks like this, before using an Ectoplasm:

Crash log here:
lovely-2025.06.07-16.19.03.log.

Turning off mods allows me to use this Ectoplasm correctly, and this issue occurs with Saturn being the only used mod. (Turning off mods gets rid of all but 1 of the cards of my stacks, so this wouldn't work as a workaround).

Let me know if you need any more info, or if I could provide a save file that would help in debugging this. Thanks!

[GradualSyrup]

For more info, did some messing around with the mod, the issue should be present in stack.lua. Workaround is to just split the Ectoplasm and it seems to work fine. Would still be worth fixing the game crash I'd think, since other cards work fine when using the USE button to just use one.

[Cdrow59]

The same crash occurs when using Hex, not just Ectoplasm. It only happens when the game tries to check for eligibility, likely during the call to card.lua:1718 (attempt to index local 'eligible_card' (a nil value)). So far, it seems isolated to cards that require eligibility checks when used from the stack.

This crash is easily reproducible using a Perkeo seed with the Ghost deck. Just copy a Hex and then try to use it once it's stacked. Here’s the exact seed I used (found via Brainstorm):

SEED: YGKBCMWT

Here is my log using hex,
lovely-2025.08.01-21.02.24.log