diff --git a/app/views/admin/announcements/settings.html.erb b/app/views/admin/announcements/settings.html.erb
index c2d175f..aec6b67 100644
--- a/app/views/admin/announcements/settings.html.erb
+++ b/app/views/admin/announcements/settings.html.erb
@@ -46,7 +46,10 @@
 	}
 
 </style>
-<% sub_managers = @module_app.sub_managers %>
+<% 
+	sub_managers = @module_app.sub_managers
+	sub_managers.delete(nil)
+%>
 <div id="notification">Click on Submit to save the changes.</div>
 <%= form_for @setting, url: (@setting.new_record? ? admin_announcement_createsettings_path : admin_announcement_updatesettings_path), html: {class: "form-horizontal main-forms"} do |f| %> 
 <div class="input-area">