Index: /controller/wpsg_ShopController.class.php
===================================================================
--- /controller/wpsg_ShopController.class.php	(revision 5401)
+++ /controller/wpsg_ShopController.class.php	(revision 5403)
@@ -3163,5 +3163,5 @@
 			}
 			
-			if ($this->hasFrontendError() || $this->hasFrontendMessage() && !$this->bMessageOut)
+			if (($this->hasFrontendError() || $this->hasFrontendMessage()) && $this->bMessageOut === false)
 			{