500 internal server error

Hi,
first excuse my bad english (I’m italian),
I am writing because I would need your kind help to solve a problem that I had on my website where Wallstreet theme is installed:

accessing the site directly
https://luigidapontephotographer.com

or trying to access the administrator page
https://luigidapontephotographer.com/wp-admin/

I always get a 500 internal server error.

The error identified in error_log file is the following:

public_html/wp-content/themes/wallstreet/functions/breadcrumbs/breadcrumbs.php on line 62

I ask you, kindly, what is the change I have to make to solve the problem.
I am newbie and I really do not know a solution for this.

Thank you and I look forward to your kind feedback and I hope for a solution.

Regards to all

The page I need help with: [log in to see the link]