From 996593375eccbc78685fd8005ebd96ae45b130cb Mon Sep 17 00:00:00 2001
From: raoulvdberge <raoulvdberge@gmail.com>
Date: Sun, 30 Jan 2022 15:02:44 +0100
Subject: [PATCH] Backport 1224833c7728c338e47e0acd1c6079e013e90dc2 to MC
 1.16.5 (0.5.2)

---
 CHANGELOG.md                                                  | 1 +
 .../pipe/attachment/extractor/ExtractorAttachment.java        | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f1a159a..bc673e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 ### Fixed
 
 - Fixed random client crashes by [@malte0811](https://github.com/malte0811).
+- Fixed crash when Extractor Attachment is interacting with inventories that have no slots.
 
 ## [0.5.1] - 2021-11-28
 
diff --git a/src/main/java/com/refinedmods/refinedpipes/network/pipe/attachment/extractor/ExtractorAttachment.java b/src/main/java/com/refinedmods/refinedpipes/network/pipe/attachment/extractor/ExtractorAttachment.java
index 3e36646..47c0d60 100644
--- a/src/main/java/com/refinedmods/refinedpipes/network/pipe/attachment/extractor/ExtractorAttachment.java
+++ b/src/main/java/com/refinedmods/refinedpipes/network/pipe/attachment/extractor/ExtractorAttachment.java
@@ -139,6 +139,10 @@ private void update(ItemNetwork network, BlockPos sourcePos, IItemHandler source
     }
 
     private Pair<Destination, Integer> findDestinationAndSourceSlot(BlockPos sourcePos, IItemHandler source) {
+        if (source.getSlots() <= 0) {
+            return null;
+        }
+        
         int startIndex = 0;
 
         do {