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Hook::exec('displayPayment') return blank page


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Hi, I develop a module and I need html, which returns display payment hook, to use in backoffice module configure page. In front office all good.

This is my code

       $displayPayment = Hook::exec('displayPayment');
        $html = str_get_html($displayPayment);
        $i = 0;
        foreach($html->find('a') as $a) {            
                $payment_methods[$i]['id_option'] = $i;           
                $payment_methods[$i]['payment_method'] = $a->plaintext;  

I found that after calling 
$result = $this->getCurrentSubTemplate($template, $cacheId, $compileId)->fetch();
in class ModuleCore method display() showing blank page(debug mode enable).

Any help please?
Edited by se1989rg (see edit history)
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