that method is the correct way of adding the CSS version of typekit.
The only reason a crash may occur is if there is an error in your Code Snippet. Does it report any particular error and can you share the code you’re adding?
Hi David,
I’m using Desktop Server locally and got this message after activating it.
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘tu_add_typefit_fonts’ not found or invalid function name in /Users/designmini/Documents/Websites/www.generateblueprint-nov2019.dev.cc/wp-includes/class-wp-hook.php on line 288