diff --git a/source/de/anomic/crawler/retrieval/LoaderDispatcher.java b/source/de/anomic/crawler/retrieval/LoaderDispatcher.java
index 398d89ec9..4fddfabcd 100644
--- a/source/de/anomic/crawler/retrieval/LoaderDispatcher.java
+++ b/source/de/anomic/crawler/retrieval/LoaderDispatcher.java
@@ -109,7 +109,7 @@ public final class LoaderDispatcher {
             final yacyURL url,
             final boolean forText,
             final boolean global
-                    ) throws IOException {
+                    ) {
         return new Request(
                     sb.peers.mySeed().hash, 
                     url, 
diff --git a/source/de/anomic/kelondro/blob/MapView.java b/source/de/anomic/kelondro/blob/MapView.java
index eaedeba45..72dfad79f 100644
--- a/source/de/anomic/kelondro/blob/MapView.java
+++ b/source/de/anomic/kelondro/blob/MapView.java
@@ -135,14 +135,16 @@ public class MapView {
      * @throws IOException
      */
     public void put(String key, final Map<String, String> newMap) throws IOException {
-        assert (key != null);
-        assert (key.length() > 0);
-        assert (newMap != null);
+        assert key != null;
+        assert key.length() > 0;
+        assert newMap != null;
         key = normalizeKey(key);
-        
+        assert blob != null;
         synchronized (this) {
             // write entry
-            blob.put(key.getBytes("UTF-8"), map2string(newMap, "W" + DateFormatter.formatShortSecond() + " ").getBytes("UTF-8"));
+        	String s = map2string(newMap, "W" + DateFormatter.formatShortSecond() + " ");
+        	assert s != null;
+            blob.put(key.getBytes("UTF-8"), s.getBytes("UTF-8"));
     
             // write map to cache
             cache.put(key, newMap);
diff --git a/source/de/anomic/kelondro/index/SimpleARC.java b/source/de/anomic/kelondro/index/SimpleARC.java
index 7e7231591..5a8795d05 100644
--- a/source/de/anomic/kelondro/index/SimpleARC.java
+++ b/source/de/anomic/kelondro/index/SimpleARC.java
@@ -62,16 +62,18 @@ public class SimpleARC <K, V> {
     }
     
     /**
-     * put a value to the cache. The value may NOT exist before.
-     * This restriction is used here to check possible algorithm logic error cases.
+     * put a value to the cache.
      * @param s
      * @param v
      */
     public void put(K s, V v) {
-        assert this.levelA.get(s) == null;
-        assert this.levelB.get(s) == null;
-        this.levelA.put(s, v);
-        assert (this.levelA.size() <= cacheSize); // the cache should shrink automatically
+        if (this.levelB.containsKey(s)) {
+        	this.levelB.put(s, v);
+            assert (this.levelB.size() <= cacheSize); // the cache should shrink automatically
+        } else {
+        	this.levelA.put(s, v);
+            assert (this.levelA.size() <= cacheSize); // the cache should shrink automatically
+        }
     }
     
     /**