it seems that the $attributes is an instanceof of ArrayDecorator, so
you should convert it to an array, see fixed code for Symfony\Bundle
\FrameworkBundle\Templating\HtmlGenerator.php.

    public function tag($tag, $attributes = array())
    {
        if (empty($tag)) {
            return '';
        }

        if ($attributes instanceof \Symfony\Component\OutputEscaper
\ArrayDecorator) {
            $attributes = $attributes->getRawValue();
        }

        return sprintf('<%s%s%s', $tag, $this-
>attributes($attributes), self::$xhtml ? ' />' : (strtolower($tag) ==
'input' ? '>' : sprintf('></%s>', $tag)));
    }

    public function contentTag($tag, $content = null, $attributes =
array())
    {
        if (empty($tag)) {
            return '';
        }

        if ($attributes instanceof \Symfony\Component\OutputEscaper
\ArrayDecorator) {
            $attributes = $attributes->getRawValue();
        }

        return sprintf('<%s%s>%s</%s>', $tag, $this-
>attributes($attributes), $content, $tag);
    }

-- 
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