Error on admin page while copy product

Hi

I get some error when i click copy on product in admin page.

Notice: Undefined index: product_description in /home/printerbul/domains/printerbullet.com/public_html/vqmod/vqcache/vq2-admin_model_catalog_product.php on line 74Warning: Invalid argument supplied for foreach() in /home/printerbul/domains/printerbullet.com/public_html/vqmod/vqcache/vq2-admin_model_catalog_product.php on line 74Warning: Cannot modify header information - headers already sent by (output started at /home/printerbul/domains/printerbullet.com/public_html/admin/index.php:85) in /home/printerbul/domains/printerbullet.com/public_html/vqmod/vqcache/vq2-system_engine_controller.php on line 41Warning: Cannot modify header information - headers already sent by (output started at /home/printerbul/domains/printerbullet.com/public_html/admin/index.php:85) in /home/printerbul/domains/printerbullet.com/public_html/vqmod/vqcache/vq2-system_engine_controller.php on line 42

Line 74 (admin/model/catalog/product.php) :

foreach ($data['product_description'] as $language_id => $value) {
$this->db->query("INSERT INTO " . DB_PREFIX . "product_description SET product_id = '" . (int)$product_id . "', language_id = '" . (int)$language_id . "', name = '" . $this->db->escape($value['name']) . "', meta_keyword = '" . $this->db->escape($value['meta_keyword']) . "', meta_description = '" . $this->db->escape($value['meta_description']) . "', description = '" . $this->db->escape($value['description']) . "', tag = '" . $this->db->escape($value['tag']) . "', short_desc = '" . $this->db->escape($value['short_desc']) . "'");
}

Any idea what could be wrong?

Thanks!
Eric