Index: trunk/psastro/src/psastroAstromGuess.c
===================================================================
--- trunk/psastro/src/psastroAstromGuess.c	(revision 21422)
+++ trunk/psastro/src/psastroAstromGuess.c	(revision 23989)
@@ -382,6 +382,12 @@
     psStats *statsQ = psStatsAlloc (PS_STAT_SAMPLE_MEAN | PS_STAT_SAMPLE_STDEV);
 
-    psVectorStats (statsP, cornerPd, NULL, cornerMK, 1);
-    psVectorStats (statsQ, cornerQd, NULL, cornerMK, 1);
+    if (!psVectorStats (statsP, cornerPd, NULL, cornerMK, 1)) {
+	psError(PS_ERR_UNKNOWN, false, "failure to measure stats");
+	return false;
+    }
+    if (!psVectorStats (statsQ, cornerQd, NULL, cornerMK, 1)) {
+	psError(PS_ERR_UNKNOWN, false, "failure to measure stats");
+	return false;
+    }
 
     float angle = atan2 (map->y->coeff[1][0], map->x->coeff[1][0]);