Index: trunk/psLib/src/math/psPolynomialMD.c
===================================================================
--- trunk/psLib/src/math/psPolynomialMD.c	(revision 16811)
+++ trunk/psLib/src/math/psPolynomialMD.c	(revision 16812)
@@ -359,4 +359,5 @@
     psVector *vector = psVectorAlloc(numTerms, PS_TYPE_F64); // Least-squares vector
     psVector *ownMask = psVectorAlloc(numValues, PS_TYPE_U8); // Our own mask for input values
+    psVectorInit(ownMask, 0);
     if (mask) {
         for (int i = 0; i < numValues; i++) {