Index: /trunk/ppMerge/src/ppMergeScaleZero.c
===================================================================
--- /trunk/ppMerge/src/ppMergeScaleZero.c	(revision 10743)
+++ /trunk/ppMerge/src/ppMergeScaleZero.c	(revision 10744)
@@ -236,5 +236,10 @@
                         }
                     }
-                    psVectorStats(bgStats, sample, sampleMask, NULL, options->combine->maskVal);
+                    status = psVectorStats(bgStats, sample, sampleMask, NULL, options->combine->maskVal);
+		    if (!status) {
+		      psTrace("ppMerge", 3, "failed to get stats for for %s, cell %d is %f\n", name, cellNum,
+			      background->data.F32[i][cellNum]);
+		      psErrorClear();
+		    }
                     psFree(sample);
                     psFree(sampleMask);