From 346b4b8b20d0619cc2bf6112db24b111e1698ab2 Mon Sep 17 00:00:00 2001
From: Intelli <contact@intelli.software>
Date: Wed, 8 May 2024 13:18:42 -0600
Subject: [PATCH] Fixed occasional NullPointerException while processing hopper
 transactions (fixes #539)

---
 .../consumer/process/ContainerTransactionProcess.java      | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/main/java/net/coreprotect/consumer/process/ContainerTransactionProcess.java b/src/main/java/net/coreprotect/consumer/process/ContainerTransactionProcess.java
index ea0fd99..2fc3a96 100644
--- a/src/main/java/net/coreprotect/consumer/process/ContainerTransactionProcess.java
+++ b/src/main/java/net/coreprotect/consumer/process/ContainerTransactionProcess.java
@@ -1,7 +1,9 @@
 package net.coreprotect.consumer.process;
 
 import java.sql.PreparedStatement;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
@@ -46,8 +48,9 @@ class ContainerTransactionProcess {
                         }
                     }
                     else if (loggingChestId.startsWith("#hopper")) {
-                        if (force_size == 0 && ConfigHandler.oldContainer.get(loggingChestId).size() == 1 && ConfigHandler.transactingChest.get(transactingChestId).isEmpty()) {
-                            int loopCount = ConfigHandler.loggingChest.get(loggingChestId);
+                        List<Object> transactingChest = ConfigHandler.transactingChest.get(transactingChestId);
+                        if (force_size == 0 && ConfigHandler.oldContainer.getOrDefault(loggingChestId, Collections.synchronizedList(new ArrayList<>())).size() == 1 && transactingChest != null && transactingChest.isEmpty()) {
+                            int loopCount = ConfigHandler.loggingChest.getOrDefault(loggingChestId, 0);
                             int maxInventorySize = (99 * 54);
                             try {
                                 Inventory checkInventory = (Inventory) inventory;