Index: trunk/psLib/src/math/psClip.c
===================================================================
--- trunk/psLib/src/math/psClip.c	(revision 10999)
+++ trunk/psLib/src/math/psClip.c	(revision 11619)
@@ -82,5 +82,5 @@
         if (numValid * keepFrac >= params->numKeep) {
             psTrace("psLib.math", 1, "Applying min/max clipping.\n");
-            psVector *index = psVectorSortIndex(index, values);
+            psVector *index = psVectorSortIndex(NULL, values);
             int numLow = numValid * params->fracLow; // Number of low values to clip
             int numHigh = numValid * params->fracHigh; // Number of high values to clip