From 49d91b94c3e299bc8aefde823c5add91af3a22ff Mon Sep 17 00:00:00 2001
From: Michael Peter Christen <mc@yacy.net>
Date: Tue, 5 Aug 2014 21:31:59 +0200
Subject: [PATCH] npe fix in crawler

---
 source/net/yacy/crawler/HostBalancer.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/net/yacy/crawler/HostBalancer.java b/source/net/yacy/crawler/HostBalancer.java
index 0d1d985fc..37117ddb0 100644
--- a/source/net/yacy/crawler/HostBalancer.java
+++ b/source/net/yacy/crawler/HostBalancer.java
@@ -336,7 +336,7 @@ public class HostBalancer implements Balancer {
                         rhq = this.queues.get(rhh);
                     }
                     // to prevent that the complete roundrobinhosthashes are taken for each round, we remove the entries from the top of the fast queue
-                    List<String> lastEntries = fastTree.lastEntry().getValue();
+                    List<String> lastEntries = fastTree.size() > 0 ? fastTree.lastEntry().getValue() : null;
                     if (lastEntries != null) {
                         for (String h: lastEntries) this.roundRobinHostHashes.remove(h);
                     }