Warning: Invalid argument supplied for foreach() in /home/xxxxx/public_html/wp-content/themes/xxxx/agents.php on line 30

<?php
$agents = freehold_all_authors();
foreach($agents as $agent_id => $agent):
?>
<?php
$agent_info = get_userdata($agent_id);
?>

30: foreach($agents as $agent_id => $agent):

neden böyle derki arkadaşlar bilgisi olan varmıdır?