Impossible to access an attribute ("content") on a null variable.
<div class="page-hero__background-container">
<img class="page-hero__image" src="{{ asset_build_path('build/images/background.jpg') }}" alt="">
</div>
<div class="page-hero__image-container">
{% if page.images.template('hero').first.content.focus.value is not null %}
{% set styles = "object-position: " ~ page.images.template('hero').first.content.focus %}
{% endif %}
{% if page.images.template('hero').first %}
<img
class="page-hero__image"
src="{{ page.images.template('hero').first.thumb('hero').url }}"