diff --git a/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java b/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java
index 6f3a808..779192a 100644
--- a/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java
+++ b/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java
@@ -201,7 +201,7 @@
 	public void shrinkAll(Map<MethodExecution, Set<MethodExecution>> newToOldMethodExecutionMap) {
 		List<Reference> refs = getReferences();
 		List<Reference> collectionReferences = collectCollectionReferences(refs);
-		List<List<Reference>> collectionChains = collectCollectionChains(collectionReferences);
+		List<List<Reference>> collectionChains = collectCollectionChains(collectionReferences, newToOldMethodExecutionMap);
 		refs = replaceCollectionChains(refs, collectionChains);
 		refs = replaceStaticObjectIds(refs);
 		references = new HashSet<>(refs); // Convert to Set from List.
@@ -237,7 +237,7 @@
 		return collectionRefs;
 	}
 	
-	private List<List<Reference>> collectCollectionChains(List<Reference> collectionReferences) {
+	private List<List<Reference>> collectCollectionChains(List<Reference> collectionReferences, Map<MethodExecution, Set<MethodExecution>> newToOldMethodExecutionMap) {
 		// Collect follow references.
 		List<Reference> collectionRefs = new ArrayList<>(collectionReferences); // Create new instance of coping collectionReference.
 		List<List<Reference>> collectionChains = new ArrayList<>();
@@ -247,21 +247,30 @@
 			Reference ref = collectionRefs.get(i);
 			String srcClassName = ref.getSrcClassName();
 			String srcObjId = ref.getSrcObjectId();
-			boolean isFirstRef = true;
-			// If dstClassName matches "$[1-9]" and don't shrink References too much(JHotDrawTransform).
-			if (!ref.getDstClassName().matches(".*\\$[0-9]+.*")) {
-				for (int j = 0; j < collectionReferences.size(); j++) {
-					if (collectionReferences.indexOf(ref) != j) {
-						Reference compareRef = collectionReferences.get(j);
-						if (srcClassName.equals(compareRef.getDstClassName())
-								&& srcObjId.equals(compareRef.getDstObjectId())) {
-							isFirstRef = false;
-							break;
-						}
-					}
-				}				
+			boolean isShrinked = false;
+			for (MethodExecution me: newToOldMethodExecutionMap.keySet()) {
+				if (srcObjId.equals(me.getThisObjId())) {
+					isShrinked = true;
+					break;
+				}
 			}
-			if (isFirstRef) {
+			boolean isFirstRef = true;
+			if (isShrinked) {
+				// If dstClassName matches "$[1-9]" and don't shrink References too much(JHotDrawTransform).
+				if (!ref.getDstClassName().matches(".*\\$[0-9]+.*")) {
+					for (int j = 0; j < collectionReferences.size(); j++) {
+						if (collectionReferences.indexOf(ref) != j) {
+							Reference compareRef = collectionReferences.get(j);
+							if (srcClassName.equals(compareRef.getDstClassName())
+									&& srcObjId.equals(compareRef.getDstObjectId())) {
+								isFirstRef = false;
+								break;
+							}
+						}
+					}				
+				}
+			}
+			if (isShrinked && isFirstRef) {
 				List<Reference> collectionChain = new ArrayList<>();
 				collectionChain.add(ref);
 				collectionChains.add(collectionChain);