[1.7b3] To The Grave -> Putrescent Liquefaction = Lua Error

[EatThisShoe]

1. Cast Boneyard with a target in range.
2. Cast To The Grave, repeat if you don't get any ghouls
3. Try to sacrifice the ghouls with Putrescent Liquefaction.

EDIT: got another lua error without To The Grave, so maybe that isn't related.