The following code is not a valid HTML. You can see screenshot where the W3C validator trigger errors.
{% block meta %}
<meta itemprop="url" content="{{ object.get_meta_url }}">
<meta itemprop="name" content="{{ object.get_meta_title }}">
<meta itemprop="description" content="{{ object.get_meta_description }}">
{% if meta_image %}<meta itemprop="image" content="{{meta_image}}">{% endif %}
<title>{{ object.get_object_title }}</title>
<meta name="description" content="{{ object.get_meta_description }}">
{% endblock meta %}
The following code is not a valid HTML. You can see screenshot where the W3C validator trigger errors.