diff --git a/angelsrefining/changelog.txt b/angelsrefining/changelog.txt
index 5830d184c..0c32ab687 100644
--- a/angelsrefining/changelog.txt
+++ b/angelsrefining/changelog.txt
@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 0.12.7
+Date: ???
+  Changes:
+    - Changed library function to handle bad input data (968)
+---------------------------------------------------------------------------------------------------
 Version: 0.12.6
 Date: 04.01.2024
   Bugfixes:
diff --git a/angelsrefining/info.json b/angelsrefining/info.json
index cdd492475..b11e9e510 100644
--- a/angelsrefining/info.json
+++ b/angelsrefining/info.json
@@ -1,6 +1,6 @@
 {
   "name": "angelsrefining",
-  "version": "0.12.6",
+  "version": "0.12.7",
   "factorio_version": "1.1",
   "title": "Angel's Refining",
   "author": "Arch666Angel",
diff --git a/angelsrefining/prototypes/override-functions.lua b/angelsrefining/prototypes/override-functions.lua
index 7fdec33e3..7241a7bb8 100644
--- a/angelsrefining/prototypes/override-functions.lua
+++ b/angelsrefining/prototypes/override-functions.lua
@@ -969,24 +969,26 @@ local function adjust_technology(tech, k) -- check a tech for basic adjustments
   end
   for i = #tech.unit.ingredients, 1, -1 do
     local pack = tech.unit.ingredients[i]
-    local nk = pack.name and "name" or 1
-    local ak = pack.name and "amount" or 2
-    if to_remove[pack[nk]] then
-      table.remove(tech.unit.ingredients, i)
-    else
-      if substitution_table.science_packs[pack[nk]] then
-        pack[ak] = substitution_table.science_packs[pack[nk]].amount
-        pack[nk] = substitution_table.science_packs[pack[nk]].add
-      end
-      if modifications and modifications[pack[nk]] then
-        if modifications[pack[nk]] > 0 then
-          dup_table[pack[nk]] = true
-          pack[ak] = modifications[pack[nk]]
+    if pack then
+      local nk = pack.name and "name" or 1
+      local ak = pack.name and "amount" or 2
+      if to_remove[pack[nk]] then
+        table.remove(tech.unit.ingredients, i)
+      else
+        if substitution_table.science_packs[pack[nk]] then
+          pack[ak] = substitution_table.science_packs[pack[nk]].amount
+          pack[nk] = substitution_table.science_packs[pack[nk]].add
+        end
+        if modifications and modifications[pack[nk]] then
+          if modifications[pack[nk]] > 0 then
+            dup_table[pack[nk]] = true
+            pack[ak] = modifications[pack[nk]]
+          else
+            table.remove(tech.unit.ingredients, i)
+          end
         else
-          table.remove(tech.unit.ingredients, i)
+          dup_table[pack[nk]] = true
         end
-      else
-        dup_table[pack[nk]] = true
       end
     end
   end