From 19340968b2ff8779dcb021369f502b14fb8d77b8 Mon Sep 17 00:00:00 2001
From: Raoul Van den Berge <raoulvdberge@gmail.com>
Date: Sat, 4 Jun 2016 23:45:17 +0200
Subject: [PATCH] Also check byproducts for null

---
 src/main/java/refinedstorage/item/ItemPattern.java | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/main/java/refinedstorage/item/ItemPattern.java b/src/main/java/refinedstorage/item/ItemPattern.java
index f0e65ab5e..d02b7cb5b 100755
--- a/src/main/java/refinedstorage/item/ItemPattern.java
+++ b/src/main/java/refinedstorage/item/ItemPattern.java
@@ -106,6 +106,15 @@ public class ItemPattern extends ItemBase {
             }
         }
 
+        ItemStack[] byproducts = getByproducts(pattern);
+        if (byproducts != null) {
+            for (ItemStack byproduct : byproducts) {
+                if (byproduct == null) {
+                    return false;
+                }
+            }
+        }
+
         return true;
     }