Multiple error messages when starting og_aggregator

Upon installation (and enabling) of the module the first time I went to a group and select "Group RSS Feed" I get:

• recoverable fatal error: Object of class stdClass could not be converted to string in [drupal_home]/sites/all/modules/og_aggregator/og_aggregator.module on line 699.


• 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 3 query: SELECT COUNT(*) FROM og_aggregator_feed f JOIN og_aggregator_item i ON i.fid = f.fid WHERE f.nid = in /web/app_0/www/sites/all/modules/og_aggregator/og_aggregator.module on line 700.


• 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 'ORDER BY i.timestamp desc LIMIT 0, 10' at line 4 query: SELECT f.*, i.* FROM og_aggregator_feed f JOIN og_aggregator_item i ON i.fid = f.fid WHERE f.nid = ORDER BY i.timestamp desc LIMIT 0, 10 in [drupal_home]/sites/all/modules/og_aggregator/og_aggregator.module on line 700.

This error can be seen (publicly) at:
http://www.greensiteinfo.com/node/12/aggregator

It occurs with both 6.x-1.x-dev and 6.x-1.1

- Evan