diff --git a/APPL/MGT/ins_srtcontrole.js b/APPL/MGT/ins_srtcontrole.js
index 009d86cf1b..7c8c3e7f63 100644
--- a/APPL/MGT/ins_srtcontrole.js
+++ b/APPL/MGT/ins_srtcontrole.js
@@ -56,10 +56,12 @@ function callback_ctr_info(data, textStatus)
 function change_ctr_discipline()
 {
     var ctr_disc = $("#ctr_discipline").val();
-    $.getJSON("../Shared/get_ctr_info.asp",
-              { ctr_disc: ctr_disc },
-                callback_ctr_info);
-
+    if (ctr_disc > 0)
+    {
+        $.getJSON("../Shared/get_ctr_info.asp",
+                  { ctr_disc: ctr_disc },
+                    callback_ctr_info);
+    }
 }
 
 function SelectBits()