Imagefield Title -> Node Title = Errors in Log

I have some errors occuring while using an imagefield title as node title.

I have a content type with just a single imagefield.
I want users to just fill in the image title provided by imagefield. auto nodetitle transfers the image title to node title. If the image title isn't filled i want to use the filename instead. The following code is nearly the same as it is provided in README.TXT (provided by auto nodetitle).

  $token = '[field_image_imagefield-title]';
  if (empty($token)) {
    return '[field_image_imagefield-filename]';
  }
  else {
    return $token;
  } 

It works as expected but i get error messages in my logfile:

1. Invalid argument supplied for foreach() in [systempath]/modules/node/node.module on line 561.
2. implode() [<a href='function.implode'>function.implode</a>]: Invalid arguments passed in [systempath]/modules/node/node.module on line 565.
3. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 query: SELECT n.nid, n.vid, n.type, n.status, n.created, n.changed, n.comment, n.promote, n.sticky, r.timestamp AS revision_timestamp, r.title, r.body, r.teaser, r.log, r.format, u.uid, u.name, u.picture, u.data FROM node n INNER JOIN users u ON u.uid = n.uid INNER JOIN node_revisions r ON r.vid = n.vid WHERE in [systempath]/includes/database.mysql.inc on line 172.

At this point I don't know if this is a token issue or an automatic nodetitle issue.

Another way to fetch the form values resulted in the same errors. It was done similar to the README.txt again:

global $form_values;
if ($form_values[field_image_imagefield][0]['title'] == "") {
  $name = $form_values[field_image_imagefield][0]['filename'];
} else { 
  $name = $form_values[field_image_imagefield][0]['title'];
}
return $name;

Since this is claimed to not use token i tend to say it is an automatic nodetitle issue.

Maybe this token issue is related:
#282305: Errors when using tokens with modules that are form/node generating content

Any Thoughts?
Thanks, Ronald