diff --git a/blocks/html/db/upgrade.php b/blocks/html/db/upgrade.php
index <HASH>..<HASH> 100644
--- a/blocks/html/db/upgrade.php
+++ b/blocks/html/db/upgrade.php
@@ -34,7 +34,7 @@ function xmldb_block_html_upgrade($oldversion) {
 
     $dbman = $DB->get_manager();
 
-    if ($oldversion < 2010071501) {
+    if ($oldversion < 2010071501 && false) { // TODO: MDL-23196 !!!
         $params = array();
         $sql = "SELECT * FROM {block_instances} b WHERE b.blockname = :blockname";
         $params['blockname'] = 'html';
MDL-<I> html block - prevent this update to happen. It cleans all the HTML blocks!