diff --git a/ui/src/main/resources/genesis/app/templates/common/variables.html b/ui/src/main/resources/genesis/app/templates/common/variables.html
index ab76aa769..ef6419c0b 100755
--- a/ui/src/main/resources/genesis/app/templates/common/variables.html
+++ b/ui/src/main/resources/genesis/app/templates/common/variables.html
@@ -9,13 +9,19 @@
 
   function disabled(variable, group) {
     var grp = variable.group;
-    var defaultVar = group.defVariable || '';
+    var defaultVar;
+    if (group) {
+        defaultVar = group.defVariable;
+    }
     return !_.size(variable.values) && !grp || grp && variable.name !== defaultVar  ? 'disabled="disabled"' : '';
   }
 
   function disabledInput(variable, group) {
     var grp = variable.group;
-    var defaultVar = group.defVariable || '';
+    var defaultVar;
+    if (group) {
+        defaultVar = group.defVariable;
+    }
     return grp && variable.name !== defaultVar ? 'disabled="disabled"' : ''
   }