Index: C:/Home/jstuyts/dev/wsp/hippo/Lucene/src/java/org/apache/lucene/search/ConjunctionScorer.java
===================================================================
--- C:/Home/jstuyts/dev/wsp/hippo/Lucene/src/java/org/apache/lucene/search/ConjunctionScorer.java	(revision 425666)
+++ C:/Home/jstuyts/dev/wsp/hippo/Lucene/src/java/org/apache/lucene/search/ConjunctionScorer.java	(working copy)
@@ -52,9 +52,13 @@
   }

   private boolean doNext() throws IOException {
-    while (more && first().doc() < last().doc()) { // find doc w/ all clauses
-      more = first().skipTo(last().doc());      // skip first upto last
+    Scorer firstScorer = first();
+    int lastDoc = last().doc();
+    while (more && firstScorer.doc() < lastDoc) { // find doc w/ all clauses
+      more = firstScorer.skipTo(lastDoc);      // skip first upto last
       scorers.addLast(scorers.removeFirst());   // move first to last
+      firstScorer = first();
+      lastDoc = last().doc();
     }
     return more;                                // found a doc with all clauses
   }