diff --git a/changelog.txt b/changelog.txt
index 53c377e..7b99a7e 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,6 @@
+v1.15.5:
+- FIX: Some mods with custom spells would break the anvil
+
 v1.15.4:
 - Added recipes for Sima and Juhannussima, which uses the same bonus as Whiskey
 - Added recipe for Lively Concoction, which uses the same bonus as Healthium
diff --git a/init.lua b/init.lua
index 5930126..73b903f 100644
--- a/init.lua
+++ b/init.lua
@@ -18,7 +18,7 @@ function build_spell_level_lookup_table()
   for i,v in ipairs(actions) do
     s = s .. "  [\"_" .. v.id .. "\"] = " .. "{"
     -- split spell levels by comma
-    for spell_level in v.spawn_level:gmatch("([^,]+)") do
+    for spell_level in (v.spawn_level and v.spawn_level or "10"):gmatch("([^,]+)") do
       s = s .. spell_level .. ","
     end
     s = s .. "},\n"
diff --git a/package.json b/package.json
index 996443c..f9ad7a3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "anvil_of_destiny",
-  "version": "1.15.4",
+  "version": "1.15.5",
   "description": "A mod for Noita (https://noitagame.com/) which adds an anvil into the default biomes, which lets you forge two wands into a new one!",
   "main": "",
   "scripts": {