Index: trunk/psphot/src/psphotAddNoise.c
===================================================================
--- trunk/psphot/src/psphotAddNoise.c	(revision 12792)
+++ trunk/psphot/src/psphotAddNoise.c	(revision 12922)
@@ -22,4 +22,8 @@
     float SIZE = psMetadataLookupF32 (&status, recipe, "NOISE.SIZE");
     PS_ASSERT (status, false);
+
+    if (SIZE <= 0) {
+       return true;
+    }
 
     float GAIN = psMetadataLookupF32(&status, readout->parent->concepts, "CELL.GAIN"); // Cell gain