Disable post nav arrow on first or last entry in a category

Hey,

I customized the navigation arrows so it stays in the same category and the arrows are flipped.
Next entry in the same category is on the right side and vice verca.

// Posts in the same category

add_filter("avia_post_nav_settings","avia_same_category_filter", 10, 1);
function avia_same_category_filter($settings)
{
$settings["same_category"] = true;
return $settings;
}

// Switched "Previous" und "Next" entries. next post -> right side, prev post -> left side

add_filter('avia_post_nav_entries', 'avia_apply_custom_sort_order_to_post_nav', 10, 2);
function avia_apply_custom_sort_order_to_post_nav($entries, $settings)
{
	if(!empty($entries['prev'])) $temp = $entries['prev'];
	if(!empty($entries['next'])) $entries['prev'] = $entries['next'];
	if(!empty($temp)) $entries['next'] = $temp;
	return $entries;
}

Now on the last or first entry of a post, both arrows display the same content.

I can’t figure out a way to disable the left arrow on the first post and right arrow on last post in the same category.

Example Site

Can this be solved?

Thanks in advance!