Invalid node.type values in SQL query + trackerlite_content variable results in no nodes being selected

Tracker Lite fails to show any nodes in its "Recent Posts" page. I did some investigating, and discovered that the following SQL query was being generated:

SELECT DISTINCT(n.nid), n.title, n.type, n.changed AS last_post, n.uid, u.name FROM {node} n INNER JOIN {users} u ON n.uid = u.uid WHERE n.status = 1 AND (n.type = '0' OR n.type = '1' OR n.type = '2' OR n.type = '4' OR n.type = '5' OR n.type = '6' OR n.type = '7') ORDER BY last_post DESC

As you can see, integers are being used in place of the node type strings. Digging deeper, here's the content of the trackerlite_content variable in the database:

a:7:{i:0;s:1:"0";i:1;s:1:"1";i:2;s:1:"2";i:3;s:1:"4";i:4;s:1:"5";i:5;s:1:"6";i:6;s:1:"7";}

My PHP knowledge has not yet been great enough to figure out how this error can be corrected, but I'll be hacking on it in the background.