if set to inline - anonymous users get Fatal error: Unsupported operand types in /includes/common.inc on line 1539

if set the Community tagging form: to display inline

displays ok for logged in users

however when a anonymous visitor views the node get error message below

Fatal error: Unsupported operand types in /includes/common.inc on line 1539

displays ok when switched to block

post below has possible causes of this
http://drupal.org/node/346756