Index: trunk/ippToPsps/perl/ippToPsps/DetectionBatch.pm
===================================================================
--- trunk/ippToPsps/perl/ippToPsps/DetectionBatch.pm	(revision 29992)
+++ trunk/ippToPsps/perl/ippToPsps/DetectionBatch.pm	(revision 29997)
@@ -78,5 +78,5 @@
     # get neb path of smf file
     my $nebPath = $self->{_gpc1Db}->getCameraStageSmfForThisDvoDb($self->{_dvoDb}, $self->{_expId});
-    if (!$nebPath) { return 0; }
+    if (!$nebPath) { return undef; }
 
     # get real filename from neb 'key'