Index: /views/mods/mod_productgroups/add.phtml
===================================================================
--- /views/mods/mod_productgroups/add.phtml	(revision 7773)
+++ /views/mods/mod_productgroups/add.phtml	(revision 7774)
@@ -18,5 +18,9 @@
 				<ul class="nav navbar-nav">
 					<li role="presentation" class="wpsg-customer-tab-a active"><a href="<?php echo WPSG_URL_WP; ?>wp-admin/admin.php?page=wpsg-Productgroups&wpsg_mod_action=index"><?php echo __("Produktgruppenverwaltung", "wpsg"); ?></a></li>
-                    <li role="presentation" class="active"><a href="<?php echo WPSG_URL_WP; ?>wp-admin/admin.php?page=wpsg-Productgroups&wpsg_mod_action=add"><span class="glyphicon glyphicon-plus"></span><?php echo __("Produktgruppe anlegen/bearbeiten", "wpsg"); ?></a></li>
+                    <li role="presentation" class="active"><a href="<?php
+
+                        echo wpsg_admin_url('Productgroups', '', ['wpsg_mod_action' => 'add']);
+
+                    ?>"><span class="glyphicon glyphicon-plus"></span><?php echo __("Produktgruppe anlegen/bearbeiten", "wpsg"); ?></a></li>
 				</ul>
 				<ul class="nav navbar-nav navbar-right">