Fatal error: Uncaught Error: Call to undefined function is_product() in /usr/www/users/trailgaerx/wp-content/plugins/service-booking-manager1/Admin/MPWPB_Hidden_Product.php:94 Stack trace: #0 /usr/www/users/trailgaerx/wp-includes/class-wp-hook.php(324): MPWPB_Hidden_Product->hide_hidden_wc_product_from_frontend(Object(WP)) #1 /usr/www/users/trailgaerx/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #2 /usr/www/users/trailgaerx/wp-includes/plugin.php(565): WP_Hook->do_action(Array) #3 /usr/www/users/trailgaerx/wp-includes/class-wp.php(830): do_action_ref_array('wp', Array) #4 /usr/www/users/trailgaerx/wp-includes/functions.php(1336): WP->main('') #5 /usr/www/users/trailgaerx/wp-blog-header.php(16): wp() #6 /usr/www/users/trailgaerx/index.php(17): require('/usr/www/users/...') #7 {main} thrown in /usr/www/users/trailgaerx/wp-content/plugins/service-booking-manager1/Admin/MPWPB_Hidden_Product.php on line 94