Index: /branches/eam_branches/ipp-20110213/psphot/src/psphotMergeSources.c
===================================================================
--- /branches/eam_branches/ipp-20110213/psphot/src/psphotMergeSources.c	(revision 30769)
+++ /branches/eam_branches/ipp-20110213/psphot/src/psphotMergeSources.c	(revision 30770)
@@ -723,5 +723,7 @@
 
 	    // allocate image, weight, mask for the new image for each peak
-	    pmSourceRedefinePixels (sourceOut, readout, sourceOut->peak->x, sourceOut->peak->y, sourceOut->modelPSF->fitRadius);
+	    if (sourceOut->modelPSF) {
+	      pmSourceRedefinePixels (sourceOut, readout, sourceOut->peak->x, sourceOut->peak->y, sourceOut->modelPSF->fitRadius);
+	    }
 
 	    // child sources have not been subtracted in this image, but this flag may be raised if