Index: /controller/wpsg_ShopController.class.php
===================================================================
--- /controller/wpsg_ShopController.class.php	(revision 7916)
+++ /controller/wpsg_ShopController.class.php	(revision 7917)
@@ -3218,5 +3218,6 @@
 			$out_content = $content;
 
-			if (wpsg_isSizedInt($this->get_option('wpsg_page_product')) && get_the_ID() == $this->getPagePID(self::URL_PRODUCTDETAIL) && wpsg_isSizedString($_REQUEST['wpsg_action'], 'showProdukt') && wpsg_isSizedInt($_REQUEST['produkt_id']))
+			//if (wpsg_isSizedInt($this->get_option('wpsg_page_product')) && get_the_ID() == $this->getPagePID(self::URL_PRODUCTDETAIL) && wpsg_isSizedString($_REQUEST['wpsg_action'], 'showProdukt') && wpsg_isSizedInt($_REQUEST['produkt_id']))
+			if (in_the_loop() && is_main_query() && wpsg_isSizedInt($this->get_option('wpsg_page_product')) && get_the_ID() == $this->getPagePID(self::URL_PRODUCTDETAIL) && wpsg_isSizedString($_REQUEST['wpsg_action'], 'showProdukt') && wpsg_isSizedInt($_REQUEST['produkt_id'])) 
 			{