Cron failes when chairman module has no president

[ewallah]

There should be some extra checking in the file lib.php to see if there was a president assigned to the module :

Original :
$president = $DB->get_record('chairman_members', array('chairman_id' => $event->chairman_id, 'role_id' => 1));
$from = $DB->get_record('user', array('id' => $president->user_id));

Suggested change :
if($president = $DB->get_record('chairman_members', array('chairman_id' => $event->chairman_id, 'role_id' => 1))){
$from = $DB->get_record('user', array('id' => $president->user_id));
} else {
$from = get_admin();
}