Fatal Error

I accidentally did some changes in the woocommerce-template.php and now my site shows the following error, which I have no idea how to fix.
I cannot not even enter the backoffice. When typing http://www.myacai.dk/wp-admin in the address bar, I get the same error message as below…

Can you please please help me?

Fatal error: Uncaught Error: Call to a member function get_price_html() on null in /var/www/myacai.dk/public_html/wp-content/themes/themify-ultra/woocommerce/woocommerce-template.php:130 Stack trace: #0 /var/www/myacai.dk/public_html/wp-content/themes/themify-ultra/theme-functions.php(2617): require_once() #1 /var/www/myacai.dk/public_html/wp-includes/template.php(688): require_once(‘/var/www/myacai…’) #2 /var/www/myacai.dk/public_html/wp-includes/template.php(647): load_template(‘/var/www/myacai…’, true) #3 /var/www/myacai.dk/public_html/wp-content/themes/themify-ultra/functions.php(25): locate_template(‘theme-functions…’, true) #4 /var/www/myacai.dk/public_html/wp-settings.php(424): include(‘/var/www/myacai…’) #5 /var/www/myacai.dk/public_html/wp-config.php(88): require_once(‘/var/www/myacai…’) #6 /var/www/myacai.dk/public_html/wp-load.php(37): require_once(‘/var/www/myacai…’) #7 /var/www/myacai.dk/public_html/wp-blog-header.php(13): require_once(‘/var/www/myacai…’) #8 /var/www/myacai.dk/public_html/index. in /var/www/myacai.dk/public_html/wp-content/themes/themify-ultra/woocommerce/woocommerce-template.php on line 130