Index: branches/RC/core/units/configuration/configuration_event_handler.php
===================================================================
diff -u -r8929 -r9355
--- branches/RC/core/units/configuration/configuration_event_handler.php	(.../configuration_event_handler.php)	(revision 8929)
+++ branches/RC/core/units/configuration/configuration_event_handler.php	(.../configuration_event_handler.php)	(revision 9355)
@@ -120,7 +120,7 @@
 				// 1. save user selected module root category
 				$items_info = $this->Application->GetVar($event->getPrefixSpecial(true));
 				$new_category_id = getArrayValue($items_info, 'ModuleRootCategory', 'VariableValue');
-				if ($new_category_id) {
+				if ($new_category_id !== false) {
 					unset($items_info['ModuleRootCategory']);
 					$this->Application->SetVar($event->getPrefixSpecial(true), $items_info);
 				}