New User Creation Errors

After recently updating to the CAS 5.x-2.0 on a Drupal 5.1 site, I noticed that three error messages are logged when a new user is created. Other than the error messages, the module seems to function properly. Users are created and future logins are error free. Here are the messages:

#1) Array_keys():The first argument should be an array in .../user.module on line 361.

#2) implode(): Bad arguments. in.../user.module on line 361.

#3) 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 DISTINCT(p.perm) FROM role r INNER JOIN permission p ON p.rid = r.rid WHERE r.rid IN () in .../database.mysql.inc on line 172.

After first seeing the error messages, I remembered to run update.php with on effect. Is anyone else running into this?