Index: branches/5.2.x/core/units/admin/admin_events_handler.php
===================================================================
diff -u -N -r16657 -r16664
--- branches/5.2.x/core/units/admin/admin_events_handler.php	(.../admin_events_handler.php)	(revision 16657)
+++ branches/5.2.x/core/units/admin/admin_events_handler.php	(.../admin_events_handler.php)	(revision 16664)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: admin_events_handler.php 16657 2021-01-04 08:55:31Z alex $
+* @version	$Id: admin_events_handler.php 16664 2021-01-11 08:51:24Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -1234,6 +1234,37 @@
 		$this->Conn->Query($sql);
 	}
 
+	/**
+	 * Populates URL unit cache
+	 *
+	 * @param kEvent $event Event.
+	 *
+	 * @return void
+	 */
+	protected function OnPopulateUrlUnitCacheScheduledTask(kEvent $event)
+	{
+		$sql = 'SELECT DISTINCT Prefixes
+				FROM ' . TABLE_PREFIX . 'CachedUrls';
+		$urls = $this->Conn->GetColIterator($sql);
+		$prefixes = array();
+
+		foreach ( $urls as $url_prefixes ) {
+			$url_prefixes = explode('|', trim($url_prefixes, '|'));
+
+			foreach ( $url_prefixes as $url_prefix ) {
+				$url_prefix = explode(':', $url_prefix);
+				$prefixes[$url_prefix[0]] = 1;
+			}
+		}
+
+		if ( $this->Application->isCachingType(CACHING_TYPE_MEMORY) ) {
+			$this->Application->setCache('cached_urls_unit_prefixes', array_keys($prefixes), 3600);
+		}
+		else {
+			$this->Application->setDBCache('cached_urls_unit_prefixes', serialize(array_keys($prefixes)), 3600);
+		}
+	}
+
 }