Index: branches/5.3.x/core/units/scheduled_tasks/scheduled_task_eh.php
===================================================================
diff -u -N -r16188 -r16395
--- branches/5.3.x/core/units/scheduled_tasks/scheduled_task_eh.php	(.../scheduled_task_eh.php)	(revision 16188)
+++ branches/5.3.x/core/units/scheduled_tasks/scheduled_task_eh.php	(.../scheduled_task_eh.php)	(revision 16395)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: scheduled_task_eh.php 16188 2015-05-19 00:37:18Z alex $
+* @version	$Id: scheduled_task_eh.php 16395 2016-11-12 12:43:14Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -257,6 +257,11 @@
 		{
 			parent::OnAfterConfigRead($event);
 
+			// Don't initialize 'scheduled-task' unit, because scheduled tasks are not run during install.
+			if ( defined('IS_INSTALL') && IS_INSTALL ) {
+				return;
+			}
+
 			if ( $this->Application->findModule('Name', 'Custom') ) {
 				$config = $event->getUnitConfig();