diff --git a/templates/application/config.php.erb b/templates/application/config.php.erb
index 09dee08..ec36ad8 100644
--- a/templates/application/config.php.erb
+++ b/templates/application/config.php.erb
@@ -214,18 +214,22 @@ $CONFIG = array (
     array (
       0 => 'admin',
       1 => 'forcemfa',
-    <%- index = 2 -%>
-    <%- @twofactor_enforced_groups.each do |item| -%>
+    <%- if @twofactor_enforced_groups -%>
+      <%- index = 2 -%>
+      <%- @twofactor_enforced_groups.each do |item| -%>
       <%= index %> => '<%= item %>',
-      <%- index += 1 -%>
+        <%- index += 1 -%>
+      <%- end -%>
     <%- end -%>
     ),
   'twofactor_enforced_excluded_groups' =>
     array (
-    <%- index = 0 -%>
-    <%- @twofactor_enforced_excluded_groups.each do |item| -%>
+    <%- if @twofactor_enforced_excluded_groups -%>
+      <%- index = 0 -%>
+      <%- @twofactor_enforced_excluded_groups.each do |item| -%>
       <%= index %> => '<%= item %>',
-      <%- index += 1 -%>
+        <%- index += 1 -%>
+      <%- end -%>
     <%- end -%>
     ),
   'updatechecker' => false,