Index: branches/5.2.x/core/install/upgrades.php
===================================================================
diff -u -N -r16247 -r16295
--- branches/5.2.x/core/install/upgrades.php	(.../upgrades.php)	(revision 16247)
+++ branches/5.2.x/core/install/upgrades.php	(.../upgrades.php)	(revision 16295)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: upgrades.php 16247 2015-09-02 20:48:06Z alex $
+* @version	$Id: upgrades.php 16295 2015-10-25 17:49:33Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -2058,6 +2058,11 @@
 			$table_name = $this->Application->getUnitOption('email-template', 'TableName');
 			$fields = $this->Conn->Query('DESCRIBE ' . $table_name, 'Field');
 
+			// The "_renameTables" method doesn't rename IDField, so find real one in DESCRIBE result.
+			if ( !isset($fields[$id_field]) ) {
+				$id_field = 'EventId';
+			}
+
 			if ( !isset($fields['l1_Body']) ) {
 				// column dropped - nothing to convert anymore
 				return;