.

PHI-CL/data/b/gm-vp-c.lua

@@ -681,6 +681,7 @@ local items = {
         ['space-platform-hub'] = true,
     },
     ['hidden'] = {
+        -- SPACE_AGE 0
         ['biochamber'] = 'assembling-machine',
         ['captive-biter-spawner'] = 'assembling-machine',
         ['lightning-rod']= 'lightning-attractor',

PHI-CL/data/b/gm-vp.lua

@@ -452,10 +452,12 @@ for _, v in pairs({'vulcanus_coal', 'tungsten_ore', 'calcite', 'sulfuric_acid_ge
     end
 end
 
-for k, v in pairs(items['hidden']) do
-    if data.raw[v] and data.raw[v][k] then
-        data.raw[v][k].hidden = true
-        data.raw[v][k].hidden_in_factoriopedia = true
+if items['hidden'] then
+    for k, v in pairs(items['hidden']) do
+        if data.raw[v] and data.raw[v][k] then
+            data.raw[v][k].hidden = true
+            data.raw[v][k].hidden_in_factoriopedia = true
+        end
     end
 end