Непонятное сообщение

Warning: Invalid argument supplied for foreach() in /components/users/model.php on line 788

    public function deleteInactiveUsers() {
 
		$inCore = cmsCore::getInstance();
 
		$inCore->loadClass('actions');
 
		$cfg    = $inCore->loadComponentConfig('users');
 
		$month  = $cfg['deltime'] ? $cfg['deltime'] : 6;
 
        $users_list = $this->inDB->get_table('cms_users', "DATE_SUB(NOW(), INTERVAL $month MONTH) > logdate", 'id');
 
        foreach($users_list as $usr){
            $this->deleteUser($usr['id'], true);
        }
 
        return true;
 
    }

if(!$users_list) { return false; }