<div class="comments">
<div class="comment preview">
- <img class="avatar" src="{% gravatar_for_email form.email.value 64 %}" alt="Avatar"/>
+ <img class="avatar" src="{% gravatar_url form.email.value 64 %}" alt="Avatar"/>
<div class="comment-data">
<div class="comment-author">{{ form.name.value }}</div>
</div>