Index: branches/RC/core/units/reviews/reviews_event_handler.php
===================================================================
diff -u -N -r10455 -r10519
--- branches/RC/core/units/reviews/reviews_event_handler.php	(.../reviews_event_handler.php)	(revision 10455)
+++ branches/RC/core/units/reviews/reviews_event_handler.php	(.../reviews_event_handler.php)	(revision 10519)
@@ -432,7 +432,7 @@
 		{
 			parent::OnAfterConfigRead($event);
 
-			if (preg_match('/(.*)-rev/', $event->Prefix, $regs)) {
+			if (preg_match('/(.*)-rev/', $event->Prefix, $regs) && $this->Application->prefixRegistred($regs[1])) {
 				// "Structure & Data" -> "Reviews" (section in K4)
 
 				// 1. add join to items table (for "Structure & Data" -> "Reviews" section)