Index: trunk/psModules/src/astrom/pmAstrometryDistortion.c
===================================================================
--- trunk/psModules/src/astrom/pmAstrometryDistortion.c	(revision 23487)
+++ trunk/psModules/src/astrom/pmAstrometryDistortion.c	(revision 23989)
@@ -151,8 +151,14 @@
 
             // also measure the L and M median positions as a representative coordinate
-            psVectorStats (stats, L, NULL, NULL, 0);
+            if (!psVectorStats (stats, L, NULL, NULL, 0)) {
+		psError(PS_ERR_UNKNOWN, false, "failure to measure stats");
+		goto skip;
+	    }
             grad->FP.x = stats->sampleMedian;
 
-            psVectorStats (stats, M, NULL, NULL, 0);
+            if (!psVectorStats (stats, M, NULL, NULL, 0)) {
+		psError(PS_ERR_UNKNOWN, false, "failure to measure stats");
+		goto skip;
+	    }
             grad->FP.y = stats->sampleMedian;