Index: branches/5.2.x/core/kernel/db/dbitem.php
===================================================================
diff -u -N -r16642 -r16643
--- branches/5.2.x/core/kernel/db/dbitem.php	(.../dbitem.php)	(revision 16642)
+++ branches/5.2.x/core/kernel/db/dbitem.php	(.../dbitem.php)	(revision 16643)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: dbitem.php 16642 2020-12-11 09:35:30Z alex $
+* @version	$Id: dbitem.php 16643 2020-12-11 09:37:43Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -736,8 +736,26 @@
 
 		$sql = '';
 
-		$set_fields = isset($update_fields) ? $update_fields : array_keys($this->FieldValues);
+		if ( isset($update_fields) ) {
+			$set_fields = $update_fields;
+			$forgotten_fields = array_diff(array_keys($this->GetChangedFields()), $set_fields);
 
+			if ( $forgotten_fields ) {
+				trigger_error(
+					sprintf(
+						'These fields weren\'t updated for #%s record in "%s" unit: %s',
+						$this->GetID(),
+						$this->getPrefixSpecial(),
+						implode(', ', $forgotten_fields)
+					),
+					E_USER_WARNING
+				);
+			}
+		}
+		else {
+			$set_fields = array_keys($this->FieldValues);
+		}
+
 		foreach ($set_fields as $field_name) {
 			if ( $this->skipField($field_name) ) {
 				continue;