diff --git a/source/de/anomic/crawler/Balancer.java b/source/de/anomic/crawler/Balancer.java
index 5cdaf56d7..6ff684db6 100644
--- a/source/de/anomic/crawler/Balancer.java
+++ b/source/de/anomic/crawler/Balancer.java
@@ -361,7 +361,7 @@ public class Balancer {
 		        //final int s = urlFileIndex.size();
 		        Row.Entry rowEntry = (nexthash == null) ? null : urlFileIndex.remove(nexthash);
 		        if (rowEntry == null) {
-		            System.out.println("*** rowEntry=null, nexthash=" + new String(nexthash));
+		            //System.out.println("*** rowEntry=null, nexthash=" + new String(nexthash));
 		        	rowEntry = urlFileIndex.removeOne();
 		        	if (rowEntry == null) {
 		        	    nexthash = null;
diff --git a/source/de/anomic/search/SearchEvent.java b/source/de/anomic/search/SearchEvent.java
index d87ab65e6..7f629ff86 100644
--- a/source/de/anomic/search/SearchEvent.java
+++ b/source/de/anomic/search/SearchEvent.java
@@ -467,9 +467,12 @@ public final class SearchEvent {
         
         public void run() {
             try {
+                int t = 0;
                 while (this.trigger.tryAcquire(10000, TimeUnit.MILLISECONDS)) {
                     // a trigger was released
                     prepareSecondarySearch();
+                    t++;
+                    if (t > 10) break;
                 }
             } catch (InterruptedException e) {
                 // the thread was interrupted
diff --git a/source/de/anomic/yacy/dht/PeerSelection.java b/source/de/anomic/yacy/dht/PeerSelection.java
index e2a3d4381..a901da4ec 100755
--- a/source/de/anomic/yacy/dht/PeerSelection.java
+++ b/source/de/anomic/yacy/dht/PeerSelection.java
@@ -350,7 +350,8 @@ public class PeerSelection {
             while ((s.hasNext()) && (searchcount-- > 0)) {
                 ys = s.next();
                 if ((ys != null) && (ys.get(yacySeed.LASTSEEN, "").length() > 10)) try {
-                    absage = Math.abs(System.currentTimeMillis() + DateFormatter.dayMillis - ys.getLastSeenUTC());
+                    absage = Math.abs(System.currentTimeMillis() + DateFormatter.dayMillis - ys.getLastSeenUTC()) / 1000 / 60;
+                    if (absage > Integer.MAX_VALUE) absage = Integer.MAX_VALUE;
                     seedScore.inc(ys.hash, (int) absage); // the higher absage, the older is the peer
                 } catch (final Exception e) {}
             }
diff --git a/source/net/yacy/kelondro/util/SetTools.java b/source/net/yacy/kelondro/util/SetTools.java
index 30ef3987b..7c5806e83 100644
--- a/source/net/yacy/kelondro/util/SetTools.java
+++ b/source/net/yacy/kelondro/util/SetTools.java
@@ -33,6 +33,7 @@ import java.io.InputStreamReader;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Comparator;
+import java.util.ConcurrentModificationException;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;
@@ -40,6 +41,7 @@ import java.util.TreeMap;
 import java.util.TreeSet;
 
 import net.yacy.kelondro.index.HandleSet;
+import net.yacy.kelondro.logging.Log;
 
 public class SetTools {
 
@@ -133,16 +135,23 @@ public class SetTools {
     private final static <A, B> TreeMap<A, B> joinConstructiveByTest(final TreeMap<A, B> small, final TreeMap<A, B> large, final boolean concatStrings) {
         final Iterator<Map.Entry<A, B>> mi = small.entrySet().iterator();
         final TreeMap<A, B> result = new TreeMap<A, B>(large.comparator());
-        Map.Entry<A, B> mentry1;
-        B mobj2;
-        while (mi.hasNext()) {
-            mentry1 = mi.next();
-            mobj2 = large.get(mentry1.getKey());
-            if (mobj2 != null) {
-                if (mentry1.getValue() instanceof String) {
-                    result.put(mentry1.getKey(), (B) ((concatStrings) ? (mentry1.getValue() + (String) mobj2) : mentry1.getValue()));
-                } else {
-                    result.put(mentry1.getKey(), mentry1.getValue());
+        synchronized (mi) {
+            Map.Entry<A, B> mentry1;
+            B mobj2;
+            loop: while (mi.hasNext()) {
+                try {
+                    mentry1 = mi.next();
+                    mobj2 = large.get(mentry1.getKey());
+                    if (mobj2 != null) {
+                        if (mentry1.getValue() instanceof String) {
+                            result.put(mentry1.getKey(), (B) ((concatStrings) ? (mentry1.getValue() + (String) mobj2) : mentry1.getValue()));
+                        } else {
+                            result.put(mentry1.getKey(), mentry1.getValue());
+                        }
+                    }
+                } catch (ConcurrentModificationException e) {
+                    Log.logWarning("SetTools", e.getMessage(), e);
+                    break loop;
                 }
             }
         }