From 4def61733225530db6694e8a8530cb24a3168070 Mon Sep 17 00:00:00 2001
From: Gabriel Tofvesson <gabto095@student.liu.se>
Date: Sat, 24 Apr 2021 00:01:28 +0200
Subject: [PATCH] Fix NPE in item stack sort comparator

---
 src/dev/w1zzrd/invtweaks/command/SortCommandExecutor.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/dev/w1zzrd/invtweaks/command/SortCommandExecutor.java b/src/dev/w1zzrd/invtweaks/command/SortCommandExecutor.java
index 5f119ed..b915aa0 100644
--- a/src/dev/w1zzrd/invtweaks/command/SortCommandExecutor.java
+++ b/src/dev/w1zzrd/invtweaks/command/SortCommandExecutor.java
@@ -91,6 +91,9 @@ public class SortCommandExecutor implements CommandExecutor {
     private static class ItemStackComparator implements Comparator<ItemStack> {
         @Override
         public int compare(ItemStack o1, ItemStack o2) {
+            if (o1 == null || o2 == null)
+                return o1 == o2 ? 0 : o1 == null ? 1 : -1;
+
             final Material m1 = o1.getType();
             final Material m2 = o2.getType();