diff -u -r1.1 -r1.2
--- CheatFragmentMerger.java	16 Dec 2005 21:11:39 -0000	1.1
+++ CheatFragmentMerger.java	6 Jan 2006 01:01:38 -0000	1.2
@@ -66,7 +66,14 @@

 		    List<Cluster> tmpAssocClus2 = assocE2.associateMCParticleToClusters(alpha);
 		    if (tmpAssocClus2.size()>0) {
 			Cluster match = tmpAssocClus2.iterator().next();

-			if (match == fragment) { throw new AssertionError("BUG"); }

+			if (match == fragment) { 
+			    // In this case, the "fragment" is actually the primary cluster for this particle,
+			    // i.e. we misidentified it as a fragment before. At this point, we know that there
+			    // are no non-fragment clusters from this MC particle. Cheating doesn't make a lot
+			    // of sense here...
+
+			    throw new AssertionError("BUG"); 
+			}

 			if (match==null) {
 			    throw new AssertionError("BUG");
 			} else {