Index: trunk/Ohana/src/opihi/cmd.data/subset.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.data/subset.c	(revision 30610)
+++ trunk/Ohana/src/opihi/cmd.data/subset.c	(revision 34461)
@@ -13,6 +13,10 @@
   Npts = 0;
 
+  if (argc < 6) {
+    gprint (GP_ERR, "SYNTAX: subset vec = vec [if/where] (logic expression)\n");
+    return (FALSE);
+  }
+
   valid = TRUE;
-  valid &= (argc >= 6);
   valid &= !strcmp(argv[2], "=");
   valid &= !strcmp(argv[4], "if") || !strcmp (argv[4], "where");