From a28faabfd2067a515b5903eabad91b9db3e7cd42 Mon Sep 17 00:00:00 2001
From: orbiter <orbiter@6c8d7289-2bf4-0310-a012-ef5d649a1542>
Date: Sun, 14 Sep 2008 20:03:59 +0000
Subject: [PATCH] fix for
 http://forum.yacy-websuche.de/viewtopic.php?f=6&t=1351&p=9242#p9242

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@5154 6c8d7289-2bf4-0310-a012-ef5d649a1542
---
 source/de/anomic/crawler/ResultURLs.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/source/de/anomic/crawler/ResultURLs.java b/source/de/anomic/crawler/ResultURLs.java
index dc13a6ab6..d5d325494 100644
--- a/source/de/anomic/crawler/ResultURLs.java
+++ b/source/de/anomic/crawler/ResultURLs.java
@@ -284,9 +284,11 @@ public final class ResultURLs {
 
     public synchronized boolean remove(final String urlHash) {
         if (urlHash == null) return false;
+        String hash;
         for (int stack = 1; stack <= 6; stack++) {
             for (int i = getStackSize(stack) - 1; i >= 0; i--) {
-                if (getUrlHash(stack, i).equals(urlHash)) {
+                hash = getUrlHash(stack, i);
+                if (hash != null && hash.equals(urlHash)) {
                     removeStack(stack, i);
                     return true;
                 }