Fatal error: Uncaught Error: Call to undefined function is_shop()
in /home/customer/www/linlydesigns.com/public_html/wp-content/themes/betheme/header-shop.php on line 91

Call stack:

1. require_once()
   wp-includes/template.php:770
2. load_template()
   wp-includes/template.php:716
3. locate_template()
   wp-includes/general-template.php:48
4. get_header()
   wp-content/themes/betheme/single-template.php:13
5. include()
   wp-includes/template-loader.php:106
6. require_once()
   wp-blog-header.php:19
7. require()
   index.php:17