Can't edit transaction from /admin/user/userpoints

I'm using points moderation but when I go to the administration page and click one of the "edit" links, I first get this error: warning: htmlspecialchars() expects parameter 1 to be string, object given in /home/webwis2/public_html/dev2/includes/bootstrap.inc on line 631.

Then, when I get to the admin form and try to edit a transaction, I get this error: warning: mysql_real_escape_string() expects parameter 1 to be string, object given in /home/webwis2/public_html/dev2/includes/database.mysql.inc on line 400.

Ultimately, the UPDATE query does not complete.

I did a backtrace to see if I could locate the value of "paramater 1" and believe this might be the culprit (but I don't know how to fix it):

userpoints_admin_txn_submit,

Array
(
[0] => userpoints_admin_txn
[1] => Array
(
[txn_user] => stdClass Object
(
[uid] => 18
[name] => drachiswipug
[pass] => 6b74c545508a081c15aa7221c764f475
[mail] => drachiswipug@dev2.webwiseone.com
[mode] => 0
[sort] => 0
[threshold] => 0
[theme] =>
[signature] =>
[created] => 1177554106
[access] => 1177554106
[login] => 0
[status] => 1
[timezone] =>
[language] =>
[picture] =>
[init] =>
[data] =>
[roles] => Array
(
[2] => authenticated user
)

[og_groups] => Array
(
)

)

[points] => 5
[time_stamp] => 2007-08-15 19:19 +0000
[description] => zzzzzzzzzzz
[reference] =>
[approver_uid] => 0
[event] => post comment
[status] => 1
[mode] => edit
[op] => Save
[submit] => Save
[form_token] => f3ffc4c6990745e8b89927e747d320f0
[form_id] => userpoints_admin_txn
)

)

Let me know if I can provide any more info.

Thanks,
Kevin