After I added a group to my survey, I started getting the following traceback:

CDbCommand failed to execute the SQL statement: SQLSTATE[22P02]: Invalid text representation: 7 ERROR: invalid input syntax for integer: "2 OR ugid=1"
LINE 1: SELECT FROM "user_groups" "t" WHERE ugid = '2 OR ugid=1'
^. The SQL statement executed was: SELECT FROM "user_groups" "t" WHERE ugid = :ugid

This stems from code in admin/surveypermission.php
84 if(isset($group_ids) && $group_ids[0] != NULL)
85 {
86 $group_ids_query = implode(" OR ugid=", $group_ids);
87 unset($group_ids);
88
89 $result4 = User_groups::model()->findAll('ugid = :ugid',array(':ugid' => $group_ids_query));
90
91 foreach ($result4 as $resul4row)
92 {
93 $group_names[] = $resul4row->name;
94 }