@@ -204,9 +204,9 @@
 				color = sorcery.lib.color(e.tone);
 			}
 			local inf = mat.data.slots[s.slot].interference
 			if inf then for k,v in pairs(inf) do
-				interference[k] = interference[k] + v
+				interference[k] = (interference[k] or 0) + v
 			end end
 		::skip::end
 		if #interference > 0 then
 			if interference.speed then stack = sorcery.data.enchants.pierce.apply(stack,-interference.speed,basecaps) end
@@ -230,9 +230,9 @@
 	drawtype = 'mesh';
 	mesh = 'sorcery-enchanter.obj';
 	paramtype = 'light';
 	paramtype2 = 'facedir';
-	groups = { cracky = 2, oddly_breakable_by_hand = 2 };
+	groups = { cracky = 2, oddly_breakable_by_hand = 2, sorcery_magitech = 1 };
 	sunlight_propagates = true;
 	selection_box = hitbox;
 	collision_box = hitbox;
 	after_dig_node = sorcery.lib.node.purge_container;