Fatal error: Uncaught Error: Call to undefined function is_product() in /home/beveiligmij/public_html/wp-content/themes/codebreakers-child/header.php:157 Stack trace: #0 /home/beveiligmij/public_html/wp-includes/template.php(722): require_once() #1 /home/beveiligmij/public_html/wp-includes/template.php(671): load_template('/home/beveiligm...', true) #2 /home/beveiligmij/public_html/wp-includes/general-template.php(41): locate_template(Array, true) #3 /home/beveiligmij/public_html/wp-content/themes/codebreakers-child/single.php(13): get_header() #4 /home/beveiligmij/public_html/wp-includes/template-loader.php(78): include('/home/beveiligm...') #5 /home/beveiligmij/public_html/wp-blog-header.php(19): require_once('/home/beveiligm...') #6 /home/beveiligmij/public_html/index.php(17): require('/home/beveiligm...') #7 {main} thrown in /home/beveiligmij/public_html/wp-content/themes/codebreakers-child/header.php on line 157