Database Server Exception

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Exception details:
File:   /hsphere/local/home/disctull/discovertullamore.com/Inc/CSystem.class
Line:   92
Type:   Code Notice

Undefined index:  Flags
Source code:
87            if (($virtual) and ($db->Row['Link'])) Goto($db->Row['Link']);
88            $this->Page = $db->Row;
89            if ($this->Page['Id'] == 0) $this->Page['Id'] = $db->Row['Id'];
90            $this->Page['Ancestors'] = array();
91            if ($virtual) {
92                if (CheckFlag($this->Page['Flags'], 9)) {
93                    $sql = 'SELECT Name FROM Pages WHERE (Parent=' . $this->Page['Id'] . ') AND (Display=1) AND (Flags>127) ORDER BY Weight ASC, Id ASC';
94                    if (!$db->GetData($sql)) $db->Error('aaa');;
95                    //while ($row = mysql_fetch_assoc($db->Result)) Goto('Index.php?Page=' . $row['Name']);
96                    while ($row = mysql_fetch_assoc($db->Result)) Goto($row['Name']);
97                }
Debug trace:
#1 [Index.php:5]              csystem->load()