Index: /trunk/ippTools/src/stacktool.c
===================================================================
--- /trunk/ippTools/src/stacktool.c	(revision 18689)
+++ /trunk/ippTools/src/stacktool.c	(revision 18690)
@@ -191,5 +191,5 @@
             }
             // Avoiding division by zero
-            psStringAppend(&havingClause, " num_warp >= %f * num_stack",
+            psStringAppend(&havingClause, " (num_warp >= %f * num_stack OR num_stack IS NULL)",
                            (double)min_frac);
         }