Error while posting comments.

While posting a comment, I get the same error reported here:

# warning: Invalid argument supplied for foreach() in /var/www/modules/node.module on line 359.
# warning: implode() [function.implode]: Bad arguments. in /var/www/modules/node.module on line 363.
# user warning: 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.moderate, 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 /var/www/includes/database.mysql.inc on line 120.

That bug report was dismissed with following rather remarkable "justification":

The other errors you posted are too low level for me to address - they aren't (necessarily) happening anywhere near my code.

I enclose a patch that solves the problem.