Index: trunk/psphot/src/psphotAddNoise.c
===================================================================
--- trunk/psphot/src/psphotAddNoise.c	(revision 32348)
+++ trunk/psphot/src/psphotAddNoise.c	(revision 33980)
@@ -47,5 +47,7 @@
 
     psArray *sources = detections->allSources;
-    psAssert (sources, "missing sources?");
+    //psAssert (sources, "missing sources?");
+    // if no work, should just return true
+    if (!sources) return true;
 
     psTimerStart ("psphot.noise");