Index: trunk/psModules/src/objects/pmSourceMoments.c
===================================================================
--- trunk/psModules/src/objects/pmSourceMoments.c	(revision 34403)
+++ trunk/psModules/src/objects/pmSourceMoments.c	(revision 35560)
@@ -151,5 +151,5 @@
 
 	float *vPix = source->pixels->data.F32[row];
-	float *vWgt = source->variance->data.F32[row];
+	float *vWgt = source->variance ? source->variance->data.F32[row] : source->pixels->data.F32[row];
 
 	psImageMaskType  *vMsk = (source->maskObj == NULL) ? NULL : source->maskObj->data.PS_TYPE_IMAGE_MASK_DATA[row];
@@ -266,6 +266,6 @@
 
     float **vPix = source->pixels->data.F32;
-    float **vWgt = source->variance->data.F32;
-    psImageMaskType  **vMsk = (source->maskObj == NULL) ? NULL : source->maskObj->data.PS_TYPE_IMAGE_MASK_DATA;
+    float **vWgt = source->variance ? source->variance->data.F32 : source->pixels->data.F32;
+    psImageMaskType **vMsk = (source->maskObj == NULL) ? NULL : source->maskObj->data.PS_TYPE_IMAGE_MASK_DATA;
 
     float RF = 0.0;
@@ -467,5 +467,5 @@
 
 	float *vPix = source->pixels->data.F32[row];
-	float *vWgt = source->variance->data.F32[row];
+	float *vWgt = source->variance ? source->variance->data.F32[row] : source->pixels->data.F32[row];
 
 	psImageMaskType *vMsk = (source->maskObj == NULL) ? NULL : source->maskObj->data.PS_TYPE_IMAGE_MASK_DATA[row];