Index: branches/5.3.x/core/units/themes/themes_eh.php
===================================================================
diff -u -N -r15698 -r16124
--- branches/5.3.x/core/units/themes/themes_eh.php	(.../themes_eh.php)	(revision 15698)
+++ branches/5.3.x/core/units/themes/themes_eh.php	(.../themes_eh.php)	(revision 16124)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: themes_eh.php 15698 2013-02-19 11:33:17Z alex $
+* @version	$Id: themes_eh.php 16124 2015-01-01 14:06:22Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -53,6 +53,46 @@
 		}
 
 		/**
+		 * Ensure, that current object is always taken from live table.
+		 *
+		 * @param kDBBase|kDBItem|kDBList $object Object.
+		 * @param kEvent                  $event  Event.
+		 *
+		 * @return void
+		 */
+		protected function dbBuild(&$object, kEvent $event)
+		{
+			if ( $event->Special == 'current' ) {
+				$event->setEventParam('live_table', true);
+			}
+
+			parent::dbBuild($object, $event);
+		}
+
+		/**
+		 * Ensures that current theme detection will fallback to primary without extra DB query.
+		 *
+		 * @param kEvent $event Event.
+		 *
+		 * @return integer
+		 */
+		public function getPassedID(kEvent $event)
+		{
+			if ( $event->Special == 'current' ) {
+				$theme_id = $this->Application->GetVar('m_theme');
+
+				if ( !$theme_id ) {
+					$theme_id = 'default';
+				}
+
+				$this->Application->SetVar('m_theme', $theme_id);
+				$this->Application->SetVar($event->getPrefixSpecial() . '_id', $theme_id);
+			}
+
+			return parent::getPassedID($event);
+		}
+
+		/**
 		 * Allows to set selected theme as primary
 		 *
 		 * @param kEvent $event
@@ -92,6 +132,25 @@
 		}
 
 		/**
+		 * Validate entered stylesheet path.
+		 *
+		 * @param kEvent $event Event.
+		 *
+		 * @return void
+		 */
+		protected function OnBeforeItemUpdate(kEvent $event)
+		{
+			parent::OnBeforeItemUpdate($event);
+
+			/** @var ThemeItem $object */
+			$object = $event->getObject();
+
+			if ( $object->GetDBField('StylesheetFile') && !$object->getStylesheetFile() ) {
+				$object->SetError('StylesheetFile', 'not_found');
+			}
+		}
+
+		/**
 		 * Set's primary theme (when checkbox used on editing form)
 		 *
 		 * @param kEvent $event