From a10a6cce459422ef9a2ea47b4bbc03f2ace53c21 Mon Sep 17 00:00:00 2001
From: orbiter <orbiter@6c8d7289-2bf4-0310-a012-ef5d649a1542>
Date: Sat, 5 Sep 2009 21:52:50 +0000
Subject: [PATCH] patch for
 http://forum.yacy-websuche.de/viewtopic.php?p=17289#p17289

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6298 6c8d7289-2bf4-0310-a012-ef5d649a1542
---
 source/de/anomic/kelondro/text/ReferenceContainerCache.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/source/de/anomic/kelondro/text/ReferenceContainerCache.java b/source/de/anomic/kelondro/text/ReferenceContainerCache.java
index a5072f9ba..cbcb87cee 100644
--- a/source/de/anomic/kelondro/text/ReferenceContainerCache.java
+++ b/source/de/anomic/kelondro/text/ReferenceContainerCache.java
@@ -50,6 +50,9 @@ public final class ReferenceContainerCache<ReferenceType extends Reference> exte
 
     public class ContainerOrder implements Comparator<ReferenceContainer<ReferenceType>> {
         public int compare(ReferenceContainer<ReferenceType> arg0, ReferenceContainer<ReferenceType> arg1) {
+        	if (arg0 == arg1) return 0;
+        	if (arg0 == null) return -1;
+        	if (arg1 == null) return 1;
             return termOrder.compare(arg0.getTermHash(), arg1.getTermHash());
         }
     }