How to pass a variable to another controller's view?

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<modification>
<id>Facebook og:image fix</id>
<version>1.0</version>
<vqmver>1.0.8</vqmver>
<author>www.bewebdesign.be</author> 

<file name="catalog/controller/common/header.php">
	<operation>
		<search position="after"><![CDATA[$this->load->model('catalog/product');]]></search>
		<add><![CDATA[
if (isset($this->request->get['product_id'])) {
			$product_id = $this->request->get['product_id'];
			$product_info = $this->model_catalog_product->getProduct($product_id);

			$this->load->model('tool/image');
			if ($product_info['image']) {
				$this->data['og_image'] = str_replace( ' ', '%20', $this->model_tool_image->resize($product_info['image'],100,100) );
			} else {
				$this->data['og_image'] = 'FULL_PATH_TO_YOUR_DEFAULT_IMAGE';
			}

		} else {
			$this->data['og_image'] = 'FULL_PATH_TO_YOUR_DEFAULT_IMAGE';
		}
]]></add>
	</operation>
</file>
</modification> 

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<?php if ($og_image) { ?>
<meta property="og:image" content="<?php echo $og_image; ?>" />
<?php } ?>

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Catchable fatal error: Argument 1 passed to VQModObject::__construct() must be an instance of DOMNode, null given, called in /home/Mysite/public_html/Mysite/vqmod/vqmod.php on line 580 and defined in /home/Mysite/public_html/Mysite/vqmod/vqmod.php on line 127