PeerGroup.handlePeerDeath() don't check isRunning(). PeerGroup.stopAs…

…ync() set downloadPeer to null before channels are stopped instead.

core/src/main/java/org/bitcoinj/core/PeerGroup.java

@@ -1242,6 +1242,7 @@ public ListenableFuture stopAsync() {
             public void run() {
                 try {
                     log.info("Stopping ...");
+                    setDownloadPeer(null);
                     // Blocking close of all sockets.
                     channels.stopAsync();
                     channels.awaitTerminated();
@@ -1841,12 +1842,6 @@ protected void handlePeerDeath(final Peer peer, @Nullable Throwable exception) {
                 if (newDownloadPeer != null) {
                     setDownloadPeer(newDownloadPeer);
 
-                    // When using BlockingClient we get errors at shutdown caused by
-                    // startBlockChainDownloadFromPeer()
-                    // We add another check to terminate here if we have been shut down already
-                    if (!isRunning())
-                        return;
-
                     if (downloadListener != null) {
                         startBlockChainDownloadFromPeer(newDownloadPeer);
                     }