Need a better way to hide categories from the index loop

`<?php while (have_posts()) : the_post(); ?>
<?php if (in_category(‘516’)) continue; ?>`

I’ve been using the above hack to not show category ID 516 in my main loop. It works well except now at https://outletzine.org i only have one post at a time on the front page.

The problem is – when somebody goes to look at the previous entries (https://outletzine.org/page/2/) they are presented with a blank page where a post from category 516 would be.

Does anybody know of a better workaround or a plugin/settings change that would prevent this from happening?