Errors logged

When a user hits the protected node page, I get three errors logged. These are logged every time I hit the page. It still works, but thought you would want to know. Let me know if there's anything else you might need.

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 /l/includes/database.mysql.inc on line 172.

implode() [function.implode]: Bad arguments. in //modules/node/node.module on line 565.

Invalid argument supplied for foreach() in //modules/node/node.module on line 561.