Game crashed while entering the third room of The Molded Grave

[string "scripts/encounter/encounter_deck.lua"]:615: attempt to index a nil value (field '?')
LUA ERROR stack traceback:
    scripts/encounter/encounter_deck.lua:615 in (method) Draw (Lua) <565-664>
    scripts/components/spawncoordinator.lua:202 in (method) _PrepareForSpawn (Lua) <169-266>
    scripts/components/spawncoordinator.lua:156 in (method) OnStartRoom (Lua) <152-157>
    scripts/prefabs/dungeon.lua:231 in (upvalue) StartRoomForEntity (Lua) <228-234>
    scripts/prefabs/dungeon.lua:248 in (method) StartRoom (Lua) <243-249>
    scripts/gamelogic.lua:568 in (upvalue) BeginRoom (Lua) <510-621>
    scripts/gamelogic.lua:633 in (upvalue) DoGenerateWorld (Lua) <626-634>
    scripts/gamelogic.lua:666 in (upvalue) cb (Lua) <647-672>
    scripts/savedata/dungeonsave.lua:61 in (upvalue) cb (Lua) <50-64>
    scripts/savedata/savedata.lua:291 in () ? (Lua) <214-293>
    =[C]:-1 in (method) GetPersistentString (C) <-1--1>
    scripts/savedata/savedata.lua:214 in (method) _Load (Lua) <209-294>
    scripts/savedata/dungeonsave.lua:50 in (method) LoadRoom (Lua) <46-65>
    scripts/gamelogic.lua:647 in () ? (Lua) <636-673>
    scripts/gamelogic.lua:693 in (global) LoadWorld (Lua) <684-699>
    scripts/roomloader.lua:387 in (field) fn (Lua) <378-388>
    scripts/scheduler.lua:155 in (method) Update (Lua) <145-210>
    scripts/update.lua:137 in () ? (Lua) <121-175>