lcsim/src/org/lcsim/recon/tracking/digitization/sisim/config

diff -u -r1.3 -r1.4
--- SimTrackerHitReadoutDriver.java	24 Aug 2011 18:51:18 -0000	1.3
+++ SimTrackerHitReadoutDriver.java	26 Mar 2012 17:04:10 -0000	1.4
@@ -68,7 +68,9 @@

             if (canHandle(header.getMetaData(collection).getName()))
             {
                 for (SimTrackerHit hit : collection)

-                {

+                { 
+                	if (hit.getDetectorElement() == null)
+                		throw new RuntimeException("Can't find DetectorElement for hit!");

                 	hit.getDetectorElement().getReadout().addHit(hit);
                 	if (debug)
                 	{