diff --git a/source/de/anomic/crawler/CrawlQueues.java b/source/de/anomic/crawler/CrawlQueues.java
index 9e47ced54..5d26c2e9a 100644
--- a/source/de/anomic/crawler/CrawlQueues.java
+++ b/source/de/anomic/crawler/CrawlQueues.java
@@ -83,10 +83,12 @@ public class CrawlQueues {
         delegatedURL = new ZURL(plasmaPath, "urlDelegated3.db", true);
     }
     
+    /**
+     * tests if hash occurrs in any database
+     * @param hash
+     * @return if the hash exists, the name of the database is returned, otherwise null is returned
+     */
     public String urlExists(final String hash) {
-        // tests if hash occurrs in any database
-        // if it exists, the name of the database is returned,
-        // if it not exists, null is returned
         if (delegatedURL.exists(hash)) return "delegated";
         if (errorURL.exists(hash)) return "errors";
         for (final crawlWorker worker: workers.values()) {
diff --git a/source/de/anomic/crawler/CrawlStacker.java b/source/de/anomic/crawler/CrawlStacker.java
index 3afc4fcd4..51bb2778f 100644
--- a/source/de/anomic/crawler/CrawlStacker.java
+++ b/source/de/anomic/crawler/CrawlStacker.java
@@ -254,9 +254,9 @@ public final class CrawlStacker {
         }
 
         // check if the url is double registered
-        final String dbocc = nextQueue.urlExists(entry.url().hash());
-        if (dbocc != null || indexSegment.urlMetadata().exists(entry.url().hash())) {
-            final URLMetadataRow oldEntry = indexSegment.urlMetadata().load(entry.url().hash(), null, 0);
+        final String dbocc = nextQueue.urlExists(entry.url().hash()); // returns the name of the queue if entry exists
+        URLMetadataRow oldEntry = null;
+        if (dbocc != null || (oldEntry = indexSegment.urlMetadata().load(entry.url().hash(), null, 0)) != null) {
             final boolean recrawl = (oldEntry != null) && (profile.recrawlIfOlder() > oldEntry.loaddate().getTime());
             // do double-check
             if ((dbocc != null) && (!recrawl)) {
diff --git a/source/de/anomic/crawler/CrawlSwitchboard.java b/source/de/anomic/crawler/CrawlSwitchboard.java
index 6ac52521f..b3811873b 100644
--- a/source/de/anomic/crawler/CrawlSwitchboard.java
+++ b/source/de/anomic/crawler/CrawlSwitchboard.java
@@ -30,7 +30,6 @@ import java.io.File;
 import java.io.IOException;
 import java.util.Iterator;
 
-import de.anomic.crawler.CrawlProfile.entry;
 import de.anomic.document.Word;
 import de.anomic.kelondro.util.FileUtils;
 import de.anomic.kelondro.util.kelondroException;
diff --git a/source/de/anomic/kelondro/text/ReferenceContainerOrder.java b/source/de/anomic/kelondro/text/ReferenceContainerOrder.java
index e129f324e..f09f1d2c5 100644
--- a/source/de/anomic/kelondro/text/ReferenceContainerOrder.java
+++ b/source/de/anomic/kelondro/text/ReferenceContainerOrder.java
@@ -76,7 +76,6 @@ public class ReferenceContainerOrder<ReferenceType extends Reference> extends Ab
         return this.embeddedOrder.cardinal(key);
     }
     
-    @SuppressWarnings("unchecked")
 	public boolean equals(final Order<ReferenceContainer<ReferenceType>> otherOrder) {
         if (!(otherOrder instanceof ReferenceContainerOrder)) return false;
         return this.embeddedOrder.equals(((ReferenceContainerOrder<ReferenceType>) otherOrder).embeddedOrder);