From 44965bf3aacb421a2b229e743f650f66c3db8b11 Mon Sep 17 00:00:00 2001
From: Brevven <brevingame@gmail.com>
Date: Tue, 15 Sep 2020 17:12:39 -0700
Subject: [PATCH] check recipe exists before adding to

---
 data-util.lua | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/data-util.lua b/data-util.lua
index f1ea2b6..aec93b8 100644
--- a/data-util.lua
+++ b/data-util.lua
@@ -2,7 +2,9 @@ local data_util = {}
 
 --- Add a given quantity of titanium plates to a given recipe
 function data_util.add_titanium_ingredient(quantity, recipe)
-	table.insert(recipe.ingredients, {"titanium-plate", quantity})
+  if recipe ~= nil and recipe.ingredients ~= nil then
+    table.insert(recipe.ingredients, {"titanium-plate", quantity})
+  end
 end
 
 --- Add titanium processing as a prerequisite to a given technology