Category.php with ACF

Hi there,

I have an issue with a category.php page.
I have categories on my website with custom fields to customize their look (Header image, tiles…)
It works but the values of the custom files only show if a page is set to this category.
I mean if there is not post to show on this category, I can’t get the Category ACF values.

In may category page, before the loop I have:

$category = get_the_category();
$image_category = get_field(‘image’, $category[0]->taxonomy.’_’.$category[0]->term_id);

Is that normal?
Is it possible to get those values if the category is empty?

Cheers,