Index: branches/pap/ppStack/src/ppStackCombineFinal.c
===================================================================
--- branches/pap/ppStack/src/ppStackCombineFinal.c	(revision 25806)
+++ branches/pap/ppStack/src/ppStackCombineFinal.c	(revision 25807)
@@ -72,4 +72,6 @@
             psImageCovarianceTransfer(outRO->variance, outRO->covariance);
         }
+    } else {
+        outRO->covariance = psImageCovarianceNone();
     }