diff --git a/org.ntlab.traceAnalyzer/src/org/ntlab/trace/MethodInvocation.java b/org.ntlab.traceAnalyzer/src/org/ntlab/trace/MethodInvocation.java
index 38eda41..e444316 100644
--- a/org.ntlab.traceAnalyzer/src/org/ntlab/trace/MethodInvocation.java
+++ b/org.ntlab.traceAnalyzer/src/org/ntlab/trace/MethodInvocation.java
@@ -42,7 +42,7 @@
 	}
 
 	public String getThisObjId() {
-		return thisObjId;
+		return calledMethodExecution.getCallerMethodExecution().getThisObjId();
 	}
 
 	public String getCallerSideMethodName() {