PHP Warning in error log: A non-numeric value encountered in /vq2-catalog_controller_product_category.php on line 378

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PHP Warning:  A non-numeric value encountered in /home/xxx/public_html/vqmod/vqcache/vq2-catalog_controller_product_category.php on line 378

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	$data['results'] = sprintf($this->language->get('text_pagination'), ($product_total) ? (($page - 1) * $limit) + 1 : 0, ((($page - 1) * $limit) > ($product_total - $limit)) ? $product_total : ((($page - 1) * $limit) + $limit), $product_total, ceil($product_total / $limit));

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'start'              => ($page - 1) * $limit,

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	    $this->document->addLink($this->url->link('product/category', 'path=' . $category_info['category_id'] . '&page='. ($page - 1), true), 'prev');

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  $this->document->addLink($this->url->link('product/category', 'path=' . $category_info['category_id'] . '&page='. ($page + 1), true), 'next');

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(int) $page