PHP Fatal error: Call to undefined function content_access() on line 570

This issue stops cron operations immediately - "Cron run exceeded the time limit and was aborted."
I discovered this error in my web logs while indexing my site with Apache Solr. I suspect FileField and Content Access don't play nice with Solr?

• tried running cron as anonymous and admin, same result

Error from logs:

PHP Fatal error:  Call to undefined function content_access() in sites/modules/contrib/filefield/filefield.module on line 570

Code that appears to be in question:

function filefield_view_access($field_name, $node = NULL) {
  if (!content_access('view', content_fields($field_name), NULL, $node)) {
    return FALSE;
  }
  // No content permissions to check, so let's fall back to a more general permission.
  return user_access('access content') || user_access('administer nodes');
}

Pressflow 6.22
PHP/5.2.17
Apache Solr 6.x-1.6 (latest)
Filefield 6.x-3.9
Content Access 6.x-1.2 (latest)

Since this is happening during cron run, I can't see if this is a content problem or not. I've already searched the database for php in my nodes and blocks so thats doesn't appear to be the problem.

Any help with troubleshooting or a patch for this would be greatly appreciated.