From b4125d2bf15a87195cf8cfc2a9501a76a4c71335 Mon Sep 17 00:00:00 2001
From: CalDescent <caldescent@protonmail.com>
Date: Fri, 14 Oct 2022 11:34:46 +0100
Subject: [PATCH] Fix for NPE in verifyMemoryPoW()

---
 .../java/org/qortal/controller/OnlineAccountsManager.java    | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/java/org/qortal/controller/OnlineAccountsManager.java b/src/main/java/org/qortal/controller/OnlineAccountsManager.java
index ff20a8d0..7b60f0d9 100644
--- a/src/main/java/org/qortal/controller/OnlineAccountsManager.java
+++ b/src/main/java/org/qortal/controller/OnlineAccountsManager.java
@@ -649,6 +649,11 @@ public class OnlineAccountsManager {
             return true;
         }
 
+        // Require a valid nonce value
+        if (onlineAccountData.getNonce() == null || onlineAccountData.getNonce() < 0) {
+            return false;
+        }
+
         int nonce = onlineAccountData.getNonce();
 
         byte[] mempowBytes;