diff -u -r1.2 -r1.3
--- SiTrackerEndcap2.java	24 Nov 2008 18:26:50 -0000	1.2
+++ SiTrackerEndcap2.java	24 Nov 2008 20:37:19 -0000	1.3
@@ -33,7 +33,9 @@

     }	
 
 	void addToLCDD(LCDD lcdd, SensitiveDetector sd) throws JDOMException 

-	{			

+	{
+	    if (sd==null)
+	        throw new RuntimeException("!!!!! SD is null WTF !!!!");

         int sysId = node.getAttribute("id").getIntValue();
         String subdetName = node.getAttributeValue("name");
         vacuum = lcdd.getMaterial("Vacuum");

@@ -202,4 +204,9 @@

             posY += thickness / 2;
         }   
     }	

+	
+    public boolean isTracker()
+    {
+        return true;
+    }	

 }

\ No newline at end of file