diff --git a/org.ntlab.reverseDebugger/src/org/ntlab/reverseDebugger/CallStackLabelProvider.java b/org.ntlab.reverseDebugger/src/org/ntlab/reverseDebugger/CallStackLabelProvider.java
index 1123a4f..da8a087 100644
--- a/org.ntlab.reverseDebugger/src/org/ntlab/reverseDebugger/CallStackLabelProvider.java
+++ b/org.ntlab.reverseDebugger/src/org/ntlab/reverseDebugger/CallStackLabelProvider.java
@@ -13,9 +13,9 @@
 	public String getText(Object element) {
 		if (element instanceof TreeNode) {
 			Object value = ((TreeNode)element).getValue();
-			if (value instanceof JDIStaticMethodCaller) {
-				JDIStaticMethodCaller mc = (JDIStaticMethodCaller)value;
-				return "ThreadID: " + mc.getThreadId();
+			if (value instanceof String) {
+				String threadId = (String)value;
+				return "ThreadID: " + threadId;
 			}
 			if (value instanceof CallStackModel) {
 				CallStackModel callStackModel = (CallStackModel)value;