[RSS Feed/News] setting user secondary groups

[XenForo]

InvalidArgumentException: Attempted to convert integer to comma-separated list [secondary_group_ids] in src\XF\Mvc\Entity\Entity.php at line 759

PHP:

$group = $this->filter('group','int');
$em = $this->em()->find('myaddon:entity',$userid);
if($action == "add"){
    $em->secondary_group_ids = $group;
    $em->save();
}

Anybody?

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