diff --git a/src/org/ntlab/traceDebugger/analyzerProvider/DeltaExtractorJSON.java b/src/org/ntlab/traceDebugger/analyzerProvider/DeltaExtractorJSON.java
index 8acae26..944edf6 100644
--- a/src/org/ntlab/traceDebugger/analyzerProvider/DeltaExtractorJSON.java
+++ b/src/org/ntlab/traceDebugger/analyzerProvider/DeltaExtractorJSON.java
@@ -121,9 +121,12 @@
 					if (ownerObjectId.equals(thisObjectId)) {
 						// �t�B�[���h�Q�Ƃ̏ꍇ
 						removeList.add(refObjectId);
-						existsInFields++;					// set�������get�����o���Ă���”\��������
 						removeList.add(thisObjectId);		// ��ň�U�AthisObject ����菜��						
-						aliasList.put(refObjectId, new Alias(Alias.AliasType.FIELD, 0, refObjectId, tracePoint.duplicate()));
+						if (existsInFields == 0) {
+							// ��ԋ߂��t�B�[���h�Q�Ƃ�D�悷��
+							aliasList.put(refObjectId, new Alias(Alias.AliasType.FIELD, 0, refObjectId, tracePoint.duplicate()));
+						}
+						existsInFields++;					// set�������get�����o���Ă���”\��������
 					} else {
 						// ���ڎQ�Ƃ̏ꍇ
 						boolean isSrcSideChanged = false;