From d831972005ea0893234c59b82b98b5fe603b92a6 Mon Sep 17 00:00:00 2001
From: CalDescent <caldescent@protonmail.com>
Date: Fri, 31 Mar 2023 18:41:58 +0100
Subject: [PATCH] Fixed NPE in isMetadataEqual()

---
 .../qortal/arbitrary/ArbitraryDataTransactionBuilder.java  | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/main/java/org/qortal/arbitrary/ArbitraryDataTransactionBuilder.java b/src/main/java/org/qortal/arbitrary/ArbitraryDataTransactionBuilder.java
index 6e8d150f..a9dd4fcf 100644
--- a/src/main/java/org/qortal/arbitrary/ArbitraryDataTransactionBuilder.java
+++ b/src/main/java/org/qortal/arbitrary/ArbitraryDataTransactionBuilder.java
@@ -305,6 +305,9 @@ public class ArbitraryDataTransactionBuilder {
     }
 
     private boolean isMetadataEqual(ArbitraryDataTransactionMetadata existingMetadata) {
+        if (existingMetadata == null) {
+            return !this.hasMetadata();
+        }
         if (!Objects.equals(existingMetadata.getTitle(), this.title)) {
             return false;
         }
@@ -320,6 +323,10 @@ public class ArbitraryDataTransactionBuilder {
         return true;
     }
 
+    private boolean hasMetadata() {
+        return (this.title != null || this.description != null || this.category != null || this.tags != null);
+    }
+
     public void computeNonce() throws DataException {
         if (this.arbitraryTransactionData == null) {
             throw new DataException("Arbitrary transaction data is required to compute nonce");