Index: trunk/stac/src/sum.c
===================================================================
--- trunk/stac/src/sum.c	(revision 6771)
+++ trunk/stac/src/sum.c	(revision 6887)
@@ -10,4 +10,5 @@
     const char *outputName = argv[1];   // Output file name
     psArray *inputNames = psArrayAlloc(argc-2);
+    inputNames->n = argc - 2;
     for (int i = 2; i < argc; i++) {
         inputNames->data[i-2] = psStringCopy(argv[i]);