From 615b2d496b613c0ba6a8733854a5c76ebb6a77e7 Mon Sep 17 00:00:00 2001
From: payonel <payonel@hotmail.com>
Date: Wed, 21 Feb 2018 20:01:49 -0800
Subject: [PATCH] make no-recipe failure more obvious in code

---
 .../scala/li/cil/oc/server/component/UpgradeCrafting.scala     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/scala/li/cil/oc/server/component/UpgradeCrafting.scala b/src/main/scala/li/cil/oc/server/component/UpgradeCrafting.scala
index 7a42bf52f..a2ca1092e 100644
--- a/src/main/scala/li/cil/oc/server/component/UpgradeCrafting.scala
+++ b/src/main/scala/li/cil/oc/server/component/UpgradeCrafting.scala
@@ -57,6 +57,9 @@ class UpgradeCrafting(val host: EnvironmentHost with internal.Robot) extends pre
       val cm = CraftingManager.getInstance
       var countCrafted = 0
       val originalCraft = cm.findMatchingRecipe(CraftingInventory, host.world)
+      if (originalCraft == null) {
+        return Seq(false, 0)
+      }
       breakable {
         while (countCrafted < wantedCount) {
           val result = cm.findMatchingRecipe(CraftingInventory, host.world)