Fatal error: Uncaught Error: Call to undefined function is_shop() in /home/maestral/public_html/wp-content/themes/betheme/header-shop.php:91 Stack trace: #0 /home/maestral/public_html/wp-includes/template.php(770): require_once() #1 /home/maestral/public_html/wp-includes/template.php(716): load_template('/home/maestral/...', true, Array) #2 /home/maestral/public_html/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #3 /home/maestral/public_html/wp-content/themes/betheme/single-template.php(13): get_header('shop') #4 /home/maestral/public_html/wp-includes/template-loader.php(106): include('/home/maestral/...') #5 /home/maestral/public_html/wp-blog-header.php(19): require_once('/home/maestral/...') #6 /home/maestral/public_html/index.php(17): require('/home/maestral/...') #7 {main} thrown in /home/maestral/public_html/wp-content/themes/betheme/header-shop.php on line 91