Index: trunk/psphot/src/psphotExtendedSourceFits.c
===================================================================
--- trunk/psphot/src/psphotExtendedSourceFits.c	(revision 37624)
+++ trunk/psphot/src/psphotExtendedSourceFits.c	(revision 37881)
@@ -534,4 +534,12 @@
               Nconvolve ++;
               if (!(modelFit->flags & badModel)) {
+                  float *PAR = modelFit->params->data.F32;
+                  psEllipseAxes axes = pmPSF_ModelToAxes (PAR, modelFit->class->useReff);
+                  if (axes.major >= 100) {
+                      Nfail ++;
+                      source->mode2 |= PM_SOURCE_MODE2_EXT_FITS_FAIL;
+                      psFree(modelFit);
+                      continue;
+                  }
                   NconvolvePass ++;
 		  source->mode |= PM_SOURCE_MODE_EXTENDED_FIT;