Fatal error: Uncaught Error: Call to undefined function is_shop() in /home/strem/strem.co.uk/public/wp-content/themes/strem2019/header.php:92
Stack trace:
#0 /home/strem/strem.co.uk/public/wp-includes/template.php(770): require_once()
#1 /home/strem/strem.co.uk/public/wp-includes/template.php(716): load_template()
#2 /home/strem/strem.co.uk/public/wp-includes/general-template.php(48): locate_template()
#3 /home/strem/strem.co.uk/public/wp-content/themes/strem2019/single.php(1): get_header()
#4 /home/strem/strem.co.uk/public/wp-includes/template-loader.php(106): include('...')
#5 /home/strem/strem.co.uk/public/wp-blog-header.php(19): require_once('...')
#6 /home/strem/strem.co.uk/public/index.php(17): require('...')
#7 {main}
thrown in /home/strem/strem.co.uk/public/wp-content/themes/strem2019/header.php on line 92