Undefined index: de in node_tokens()

After installing meta tags module i get this error message on every page:
Undefined index: de in node_tokens() (Zeile 140 von .../modules/node/node.tokens.inc)

Here is the same problem described but no issue was raised
http://drupal.org/node/1266338

"Looks like node.tokens.inc is just trying to set $item = $node->body[$node->language][0]; without checking that $node->body[$node->language] exists first ... and since this is a non-multilanguage node I would guess it's never going to exist."

Maybe this is a token iussue, but because it appeared after installing meta tags module, i put it here