it's created based on other extension for opencart 2.0.0.0
http://www.opencart.com/index.php?route=extension/extension/info&extension_id=19160&filter_search=last%20viewed&filter_license=0&filter_download_id=37
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I disabled description for the products, but in this case you need to make changes in the stylesheet.css for your theme (around line 573 for default thime):

.product-thumb .caption {
padding: 0 10px;
/* min-height: 180px; */
}

or enable description (remove comments) in catalog/.../lastvewed.tpl