Update Error

Fatal error: Can’t use function return value in write context in /home/content/p3pnexwpnas03_data02/18/2936318/html/wp-content/themes/blackfyre/header.php on line 22

I got this after the update and could not revert or fix.

I updated hoping it would fix everything randomly showing up on the front page of the site. It only started showing up after I enabled “Allow Registering”