diff --git a/include/plugin_api.inc.php b/include/plugin_api.inc.php
index 8bcb702c..f4d895f0 100644
--- a/include/plugin_api.inc.php
+++ b/include/plugin_api.inc.php
@@ -93,7 +93,10 @@ function errorHandlerCreateDOM(htmlStr) {
 
         case 'backend_save':
         case 'backend_publish':
-            echo "\n".'<script>document.addEventListener("DOMContentLoaded", function() { if (window.parent.Modernizr.indexedDB) { window.parent.serendipity.eraseEntryEditorCache(); } });</script>'."\n";
+            // this is preview_iframe.tpl updertHooks [ NOT ONLY!! See freetags ]
+            if ($_GET['serendipity']['is_iframe'] == 'true' && $_GET['serendipity']['iframe_mode'] == 'save') {
+                echo "\n".'<script>document.addEventListener("DOMContentLoaded", function() { if (window.parent.Modernizr.indexedDB) { window.parent.serendipity.eraseEntryEditorCache(); } });</script>'."\n";
+            }
             break;
 
     }