title: Error while inheriting web.assets_backend
body: <p>When inheriting <code>web.assets_backend</code> in <strong>xml</strong> file im getting the following getting error in Odoo12: </p>
  
  <pre><code>odoo.tools.convert.ParseError: "syntax error at or near "ON"
  LINE 4:                 ON CONFLICT (module, name)
                      ^
  " while parsing None:4, near
  &lt;data inherit_id="web.assets_backend"&gt;
      &lt;xpath expr="." position="inside"&gt;
          &lt;link rel="stylesheet" type="css" href="/skit_freeze_header/static/src/css/freeze_header.css"/&gt;
      &lt;/xpath&gt;
  &lt;/data&gt;
  </code></pre>
  
  <p>Below is the code used:</p>
  
  <pre><code>&lt;template id="assets_backend" inherit_id="web.assets_backend"&gt;
  </code></pre>