since a couple of days, I get the following Error message after I've saved a content page.
Notice: Undefined index: n0151 in include() (Zeile 1 von /mnt/webw/c0/01/5220001/htdocs/drupal-cms/modules/system/html.tpl.php).
The Notice appears just only in admin view, not in the common user view.
There were no changes on the Durpal System within the last couple of month and I'm wondering why this happens and why now.
I've already delete the drupal cache, but this didn't resolves the issue. Any ideas?