From 401ed1df808c39daae599537740a50b92dbc8b88 Mon Sep 17 00:00:00 2001
From: Raoul Van den Berge <raoulvdberge@gmail.com>
Date: Fri, 28 Oct 2016 17:56:25 +0200
Subject: [PATCH] Fixes #539

---
 .../com/raoulvdberge/refinedstorage/tile/TileInterface.java     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/com/raoulvdberge/refinedstorage/tile/TileInterface.java b/src/main/java/com/raoulvdberge/refinedstorage/tile/TileInterface.java
index 485116447..1ce30f471 100755
--- a/src/main/java/com/raoulvdberge/refinedstorage/tile/TileInterface.java
+++ b/src/main/java/com/raoulvdberge/refinedstorage/tile/TileInterface.java
@@ -84,7 +84,7 @@ public class TileInterface extends TileNode implements IComparable {
                     ItemStack result = network.extractItem(wanted, delta, compare);
 
                     if (result != null) {
-                        if (got == null) {
+                        if (exportItems.getStackInSlot(i) == null) {
                             exportItems.setStackInSlot(i, result);
                         } else {
                             exportItems.getStackInSlot(i).stackSize += result.stackSize;