From 73fe9e6ab51501d498cf1a970aca208ea049adff Mon Sep 17 00:00:00 2001
From: Daniel James <dwhjames@gmail.com>
Date: Mon, 25 Dec 2017 18:18:14 -0800
Subject: [PATCH] Block: Avoid NPE in hasTransactions()

Field is nullable;

```java
@Nullable List<Transaction> transactions;
```
---
 core/src/main/java/org/bitcoinj/core/Block.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/main/java/org/bitcoinj/core/Block.java b/core/src/main/java/org/bitcoinj/core/Block.java
index 5b6c6307..a962cb44 100644
--- a/core/src/main/java/org/bitcoinj/core/Block.java
+++ b/core/src/main/java/org/bitcoinj/core/Block.java
@@ -1002,7 +1002,7 @@ public class Block extends Message {
      * purely a header).
      */
     public boolean hasTransactions() {
-        return !this.transactions.isEmpty();
+        return (this.transactions != null) && !this.transactions.isEmpty();
     }
 
     /**