From 5d6ae4082bb3bbf21c5ded81cb56d9621c1bd883 Mon Sep 17 00:00:00 2001
From: Andreas Schildbach <andreas.schildbach@bloq.com>
Date: Thu, 31 Jan 2019 15:38:07 +0100
Subject: [PATCH] PeerGroup: Fix IndexOutOfBoundsException if no peer fits the
 criteria when selecting the download peer.

---
 core/src/main/java/org/bitcoinj/core/PeerGroup.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/core/src/main/java/org/bitcoinj/core/PeerGroup.java b/core/src/main/java/org/bitcoinj/core/PeerGroup.java
index 4a811d54..ce2e6bd6 100644
--- a/core/src/main/java/org/bitcoinj/core/PeerGroup.java
+++ b/core/src/main/java/org/bitcoinj/core/PeerGroup.java
@@ -2212,6 +2212,8 @@ public class PeerGroup implements TransactionBroadcaster {
                 candidates2.add(peer);
             }
         }
+        if (candidates2.isEmpty())
+            return null;
         int index = (int) (Math.random() * candidates2.size());
         return candidates2.get(index);
     }