From 99ddd24f8afaed7d93ca671fbd2c6c525922555b Mon Sep 17 00:00:00 2001
From: Raoul Van den Berge <raoulvdberge@gmail.com>
Date: Tue, 1 Nov 2016 20:24:08 +0100
Subject: [PATCH] Should fix #567

---
 .../raoulvdberge/refinedstorage/tile/TileCrafter.java  | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/main/java/com/raoulvdberge/refinedstorage/tile/TileCrafter.java b/src/main/java/com/raoulvdberge/refinedstorage/tile/TileCrafter.java
index b530e09b3..141dc000e 100755
--- a/src/main/java/com/raoulvdberge/refinedstorage/tile/TileCrafter.java
+++ b/src/main/java/com/raoulvdberge/refinedstorage/tile/TileCrafter.java
@@ -42,7 +42,15 @@ public class TileCrafter extends TileNode implements ICraftingPatternContainer {
 
     private static final String NBT_TRIGGERED_AUTOCRAFTING = "TriggeredAutocrafting";
 
-    private ItemHandlerBasic patterns = new ItemHandlerBasic(9, this, s -> s.getItem() instanceof ICraftingPatternProvider && ((ICraftingPatternProvider) s.getItem()).create(worldObj, s, this).isValid()) {
+    private ItemHandlerBasic patterns = new ItemHandlerBasic(9, this, s -> {
+        // We can only validate the crafting pattern if the world exists.
+        // If the world doesn't exist, this is probably called while reading and in that case it doesn't matter.
+        if (worldObj != null) {
+            return s.getItem() instanceof ICraftingPatternProvider && ((ICraftingPatternProvider) s.getItem()).create(worldObj, s, this).isValid();
+        }
+
+        return true;
+    }) {
         @Override
         protected void onContentsChanged(int slot) {
             super.onContentsChanged(slot);