From 41711e50b914a541b9fb7d33157c73db89ec78e6 Mon Sep 17 00:00:00 2001
From: Florian Scandella <flo@chilicode.com>
Date: Sat, 14 Oct 2017 23:53:34 +0200
Subject: [PATCH] Check for null in UpgradeInventory#saveChanges. Fixes #3159

---
 src/main/java/appeng/parts/automation/UpgradeInventory.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/main/java/appeng/parts/automation/UpgradeInventory.java b/src/main/java/appeng/parts/automation/UpgradeInventory.java
index 6b61b748..152f787d 100644
--- a/src/main/java/appeng/parts/automation/UpgradeInventory.java
+++ b/src/main/java/appeng/parts/automation/UpgradeInventory.java
@@ -144,7 +144,10 @@ public abstract class UpgradeInventory extends AppEngInternalInventory implement
 	@Override
 	public void saveChanges()
 	{
-		this.parent.saveChanges();
+		if( this.parent != null )
+		{
+			this.parent.saveChanges();
+		}
 	}
 
 	@Override