Index: /views/produkttemplates/standard.phtml
===================================================================
--- /views/produkttemplates/standard.phtml	(revision 5945)
+++ /views/produkttemplates/standard.phtml	(revision 5946)
@@ -13,4 +13,6 @@
 	//wpsg_debug($_SESSION);
   
+if (!function_exists('is_plugin_active'))
+	require_once(ABSPATH.'/wp-admin/includes/plugin.php');
 ?>
 <div class="container container-fluid-page">