Index: trunk/psModules/src/extras/pmVisual.c
===================================================================
--- trunk/psModules/src/extras/pmVisual.c	(revision 23242)
+++ trunk/psModules/src/extras/pmVisual.c	(revision 23989)
@@ -281,6 +281,12 @@
     psStats *statsX = psStatsAlloc(PS_STAT_SAMPLE_MEDIAN | PS_STAT_SAMPLE_STDEV);
     psStats *statsY = psStatsAlloc(PS_STAT_SAMPLE_MEDIAN | PS_STAT_SAMPLE_STDEV);
-    psVectorStats (statsX, xVec, NULL, NULL, 0);
-    psVectorStats (statsY, yVec, NULL, NULL, 0);
+    if (!psVectorStats (statsX, xVec, NULL, NULL, 0)) {
+	psError(PS_ERR_UNKNOWN, false, "failure to measure stats");
+	return false;
+    }
+    if (!psVectorStats (statsY, yVec, NULL, NULL, 0)) {
+	psError(PS_ERR_UNKNOWN, false, "failure to measure stats");
+	return false;
+    }
 
     float xhi  = statsX->sampleMedian + 3 *statsX->sampleStdev;