Index: /branches/pap_mops/psLib/src/types/psTree.c
===================================================================
--- /branches/pap_mops/psLib/src/types/psTree.c	(revision 25251)
+++ /branches/pap_mops/psLib/src/types/psTree.c	(revision 25252)
@@ -148,5 +148,5 @@
         long pow2;                      // Smallest power of two >= numData
         for (pow2 = 1; pow2 < numData; pow2 <<= 1);
-        numNodes = PS_MIN(pow2 - 1, 2 * numData - pow2 / 2 - 1);
+        numNodes = PS_MAX(PS_MIN(pow2 - 1, 2 * numData - pow2 / 2 - 1), 1);
     }